what we publish
Publications
2026
82.
Bassi, A
Quantum foundations for quantum technologies in the International Year of Quantum (2025) Journal Article
In: Quantum Sci. Technol., vol. 11, no. 2, 2026, ISSN: 2058-9565.
@article{Bassi2026,
title = {Quantum foundations for quantum technologies in the International Year of Quantum (2025)},
author = {A Bassi},
doi = {10.1088/2058-9565/ae49bc},
issn = {2058-9565},
year = {2026},
date = {2026-06-01},
journal = {Quantum Sci. Technol.},
volume = {11},
number = {2},
publisher = {IOP Publishing},
abstract = {Abstract
From the very beginning, quantum mechanics has been accompanied by crucial foundational questions: the possibility of visualizing physical processes, the limits of measurement epitomized by Heisenberg’s uncertainty principle, the existence of a deeper underlying reality with additional degrees of freedom, the role of measurements, and the status of locality. Long regarded as philosophical speculations, these issues were progressively reformulated into precise mathematical statements and ultimately subjected to experimental verification. The trajectory proved unpredictable: questions once dismissed as metaphysical gave rise to experimental platforms, which in turn matured into devices and technologies powering quantum computation, communication, and sensing. Yet this development is not unidirectional: advances in technology also feed back into foundations, enabling tests of principles that were previously out of reach—for example, whether quantum superposition persists at larger and larger scales and whether reality, gravity included, is fundamentally quantum. In this way, the dialogue between foundational inquiry and technological progress continues to shape both our theoretical understanding and the practical realization of quantum phenomena. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
81.
Paczos, Jerzy; Arya, Navdeep; Qvarfort, Sofia; Braun, Daniel; Zych, Magdalena
Gravitational Wave Imprints on Spontaneous Emission Journal Article
In: Phys. Rev. Lett., vol. 136, no. 11, 2026, ISSN: 1079-7114.
@article{Paczos2026,
title = {Gravitational Wave Imprints on Spontaneous Emission},
author = {Jerzy Paczos and Navdeep Arya and Sofia Qvarfort and Daniel Braun and Magdalena Zych},
doi = {10.1103/1gtr-5c2f},
issn = {1079-7114},
year = {2026},
date = {2026-05-07},
journal = {Phys. Rev. Lett.},
volume = {136},
number = {11},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Despite growing interest, there is a scarcity of known predictions in the regime where both quantum and general relativistic effects become observable. Here, we investigate a combined atom-field system in a curved spacetime, with a specific focus on gravitational-wave backgrounds. We demonstrate that a plane gravitational wave alters spontaneous emission from a single atom, manifesting itself as a direction-dependent change in the emission spectrum. Although the total decay rate remains unchanged, implying that no information about the gravitational wave is stored in the atomic internal state alone, the wave leaves imprints on the evolution of the composite atom-field system. To quantify how well this effect can be measured, we analyze both the classical Fisher information associated with photon number measurements and the quantum Fisher information. Our analysis indicates that the effect could be measured in state-of-the-art cold-atom experiments and points to spontaneous emission as a potential probe of low-frequency gravitational waves.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Despite growing interest, there is a scarcity of known predictions in the regime where both quantum and general relativistic effects become observable. Here, we investigate a combined atom-field system in a curved spacetime, with a specific focus on gravitational-wave backgrounds. We demonstrate that a plane gravitational wave alters spontaneous emission from a single atom, manifesting itself as a direction-dependent change in the emission spectrum. Although the total decay rate remains unchanged, implying that no information about the gravitational wave is stored in the atomic internal state alone, the wave leaves imprints on the evolution of the composite atom-field system. To quantify how well this effect can be measured, we analyze both the classical Fisher information associated with photon number measurements and the quantum Fisher information. Our analysis indicates that the effect could be measured in state-of-the-art cold-atom experiments and points to spontaneous emission as a potential probe of low-frequency gravitational waves.</jats:p>
80.
Wilson, Timothy; Rackham, Owen J. L.; Ulbricht, Hendrik
Oligonucleotide Selective Detection by Levitated Optomechanics Journal Article
In: ACS Nanosci. Au, vol. 6, no. 1, pp. 28–34, 2026, ISSN: 2694-2496.
@article{Wilson2025,
title = {Oligonucleotide Selective Detection by Levitated Optomechanics},
author = {Timothy Wilson and Owen J. L. Rackham and Hendrik Ulbricht},
doi = {10.1021/acsnanoscienceau.5c00128},
issn = {2694-2496},
year = {2026},
date = {2026-02-18},
journal = {ACS Nanosci. Au},
volume = {6},
number = {1},
pages = {28--34},
publisher = {American Chemical Society (ACS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
79.
Gundhi, Anirudh; Angeli, Oliviero; Bassi, Angelo
From equivalent Lagrangians to inequivalent open quantum system dynamics Journal Article
In: Phys. Rev. Research, vol. 8, no. 1, 2026, ISSN: 2643-1564.
@article{Gundhi2026,
title = {From equivalent Lagrangians to inequivalent open quantum system dynamics},
author = {Anirudh Gundhi and Oliviero Angeli and Angelo Bassi},
doi = {10.1103/4rpx-zj2x},
issn = {2643-1564},
year = {2026},
date = {2026-02-06},
journal = {Phys. Rev. Research},
volume = {8},
number = {1},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Lagrangians can differ by a total derivative without altering the equations of motion, thus encoding the same physics. This is true both classically and quantum mechanically. We show, however, that in the context of open quantum systems, two Lagrangians that differ by a total derivative can lead to inequivalent reduced dynamics. While these Lagrangians are connected via unitary transformations at the level of the global system-plus-environment description, the equivalence breaks down after tracing out the environment. We argue that only those Lagrangians for which the canonical and mechanical momenta of the system coincide lead to operationally meaningful dynamics. Applying this insight to quantum electrodynamics (QED), we derive the master equation for bremsstrahlung due to an accelerated nonrelativistic electron upto second order in the interaction. The resulting reduced dynamics predicts decoherence in the position basis and closely matches the Caldeira-Leggett form, thus resolving previous discrepancies in the literature. Our findings have implications for both QED and gravitational decoherence, where similar ambiguities arise.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Lagrangians can differ by a total derivative without altering the equations of motion, thus encoding the same physics. This is true both classically and quantum mechanically. We show, however, that in the context of open quantum systems, two Lagrangians that differ by a total derivative can lead to inequivalent reduced dynamics. While these Lagrangians are connected via unitary transformations at the level of the global system-plus-environment description, the equivalence breaks down after tracing out the environment. We argue that only those Lagrangians for which the canonical and mechanical momenta of the system coincide lead to operationally meaningful dynamics. Applying this insight to quantum electrodynamics (QED), we derive the master equation for bremsstrahlung due to an accelerated nonrelativistic electron upto second order in the interaction. The resulting reduced dynamics predicts decoherence in the position basis and closely matches the Caldeira-Leggett form, thus resolving previous discrepancies in the literature. Our findings have implications for both QED and gravitational decoherence, where similar ambiguities arise.</jats:p>
78.
Amaral, Dorian W. P.; Fuchs, Tim M.; Ulbricht, Hendrik; Tunnell, Christopher D.
Magnetic levitation as a new probe of non-Newtonian gravity Journal Article
In: Phys. Rev. D, vol. 113, no. 2, 2026, ISSN: 2470-0029.
@article{Amaral2026,
title = {Magnetic levitation as a new probe of non-Newtonian gravity},
author = {Dorian W. P. Amaral and Tim M. Fuchs and Hendrik Ulbricht and Christopher D. Tunnell},
doi = {10.1103/pqrs-bpgj},
issn = {2470-0029},
year = {2026},
date = {2026-01-27},
journal = {Phys. Rev. D},
volume = {113},
number = {2},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>
We present the magnetic oscillatory resonator for rare-interaction studies (MORRIS) and propose the first tabletop search for non-Newtonian gravity due to a Yukawa-like fifth force using a magnetically levitated particle. Our experiment comprises a levitated submillimeter magnet in a superconducting trap that is driven by a time-periodic source. Featuring short-, medium-, and long-term stages, MORRIS will admit increasing sensitivities to the force coupling strength
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline">
<a:mi>α</a:mi>
</a:math>
, optimally probing screening lengths of
<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline">
<c:mi>λ</c:mi>
<c:mo>∼</c:mo>
<c:mn>1</c:mn>
<c:mtext> </c:mtext>
<c:mtext> </c:mtext>
<c:mi>mm</c:mi>
</c:math>
. Our short-term setup provides a proof-of-principle study, with our medium- and long-term stages respectively constraining
<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline">
<e:mi>α</e:mi>
<e:mo>≲</e:mo>
<e:msup>
<e:mn>10</e:mn>
<e:mrow>
<e:mo>−</e:mo>
<e:mn>4</e:mn>
</e:mrow>
</e:msup>
</e:math>
and
<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline">
<g:mi>α</g:mi>
<g:mo>≲</g:mo>
<g:msup>
<g:mn>10</g:mn>
<g:mrow>
<g:mo>−</g:mo>
<g:mn>5</g:mn>
</g:mrow>
</g:msup>
</g:math>
, leading over existing bounds. Our projections are readily recastable to concrete models predicting the existence of fifth forces, and our statistical analysis is generally applicable to well-characterized sinusoidal driving forces. By leveraging ultralow dissipation and heavy test masses, MORRIS opens a new window onto tests of small-scale gravity and searches for physics beyond the Standard Model.
</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>
We present the magnetic oscillatory resonator for rare-interaction studies (MORRIS) and propose the first tabletop search for non-Newtonian gravity due to a Yukawa-like fifth force using a magnetically levitated particle. Our experiment comprises a levitated submillimeter magnet in a superconducting trap that is driven by a time-periodic source. Featuring short-, medium-, and long-term stages, MORRIS will admit increasing sensitivities to the force coupling strength
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline">
<a:mi>α</a:mi>
</a:math>
, optimally probing screening lengths of
<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline">
<c:mi>λ</c:mi>
<c:mo>∼</c:mo>
<c:mn>1</c:mn>
<c:mtext> </c:mtext>
<c:mtext> </c:mtext>
<c:mi>mm</c:mi>
</c:math>
. Our short-term setup provides a proof-of-principle study, with our medium- and long-term stages respectively constraining
<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline">
<e:mi>α</e:mi>
<e:mo>≲</e:mo>
<e:msup>
<e:mn>10</e:mn>
<e:mrow>
<e:mo>−</e:mo>
<e:mn>4</e:mn>
</e:mrow>
</e:msup>
</e:math>
and
<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline">
<g:mi>α</g:mi>
<g:mo>≲</g:mo>
<g:msup>
<g:mn>10</g:mn>
<g:mrow>
<g:mo>−</g:mo>
<g:mn>5</g:mn>
</g:mrow>
</g:msup>
</g:math>
, leading over existing bounds. Our projections are readily recastable to concrete models predicting the existence of fifth forces, and our statistical analysis is generally applicable to well-characterized sinusoidal driving forces. By leveraging ultralow dissipation and heavy test masses, MORRIS opens a new window onto tests of small-scale gravity and searches for physics beyond the Standard Model.
</jats:p>
We present the magnetic oscillatory resonator for rare-interaction studies (MORRIS) and propose the first tabletop search for non-Newtonian gravity due to a Yukawa-like fifth force using a magnetically levitated particle. Our experiment comprises a levitated submillimeter magnet in a superconducting trap that is driven by a time-periodic source. Featuring short-, medium-, and long-term stages, MORRIS will admit increasing sensitivities to the force coupling strength
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline">
<a:mi>α</a:mi>
</a:math>
, optimally probing screening lengths of
<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline">
<c:mi>λ</c:mi>
<c:mo>∼</c:mo>
<c:mn>1</c:mn>
<c:mtext> </c:mtext>
<c:mtext> </c:mtext>
<c:mi>mm</c:mi>
</c:math>
. Our short-term setup provides a proof-of-principle study, with our medium- and long-term stages respectively constraining
<e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline">
<e:mi>α</e:mi>
<e:mo>≲</e:mo>
<e:msup>
<e:mn>10</e:mn>
<e:mrow>
<e:mo>−</e:mo>
<e:mn>4</e:mn>
</e:mrow>
</e:msup>
</e:math>
and
<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline">
<g:mi>α</g:mi>
<g:mo>≲</g:mo>
<g:msup>
<g:mn>10</g:mn>
<g:mrow>
<g:mo>−</g:mo>
<g:mn>5</g:mn>
</g:mrow>
</g:msup>
</g:math>
, leading over existing bounds. Our projections are readily recastable to concrete models predicting the existence of fifth forces, and our statistical analysis is generally applicable to well-characterized sinusoidal driving forces. By leveraging ultralow dissipation and heavy test masses, MORRIS opens a new window onto tests of small-scale gravity and searches for physics beyond the Standard Model.
</jats:p>
2025
77.
Gaona-Reyes, J. L.; Altamura, D. G. A.; Bassi, A.
Theoretical limits of protocols for distinguishing different unravelings Journal Article
In: Phys. Rev. Research, vol. 7, no. 4, 2025, ISSN: 2643-1564.
@article{Gaona-Reyes2025,
title = {Theoretical limits of protocols for distinguishing different unravelings},
author = {J. L. Gaona-Reyes and D. G. A. Altamura and A. Bassi},
doi = {10.1103/6qnt-t3wl},
issn = {2643-1564},
year = {2025},
date = {2025-12-15},
journal = {Phys. Rev. Research},
volume = {7},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Stochastic unravelings of Lindblad-type master equations, such as stochastic Schrödinger equations, provide powerful tools to model open quantum systems and continuous measurement processes. The same master equation can be unraveled in different ways; while these unravelings differ at the level of quantum trajectories, by construction they all yield the same averaged dynamics for the density operator. A recent question of both foundational and practical relevance is whether such unravelings can be operationally distinguished, given that certain nonlinear quantities—such as covariances and higher-order moments of conditional expectation values—are unraveling dependent. We show that these quantities cannot be accessed unless the measurement scheme (i.e., the unraveling) is known in advance. This renders any operational protocol to distinguish unravelings fundamentally unfeasible. We further establish that assuming access to such nonlinear quantities without prior knowledge of the unraveling would enable superluminal signaling, violating relativistic causality.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Stochastic unravelings of Lindblad-type master equations, such as stochastic Schrödinger equations, provide powerful tools to model open quantum systems and continuous measurement processes. The same master equation can be unraveled in different ways; while these unravelings differ at the level of quantum trajectories, by construction they all yield the same averaged dynamics for the density operator. A recent question of both foundational and practical relevance is whether such unravelings can be operationally distinguished, given that certain nonlinear quantities—such as covariances and higher-order moments of conditional expectation values—are unraveling dependent. We show that these quantities cannot be accessed unless the measurement scheme (i.e., the unraveling) is known in advance. This renders any operational protocol to distinguish unravelings fundamentally unfeasible. We further establish that assuming access to such nonlinear quantities without prior knowledge of the unraveling would enable superluminal signaling, violating relativistic causality.</jats:p>
76.
Piccione, Nicolò; Bassi, Angelo
Hybrid classical-quantum Newtonian gravity with stable vacuum Journal Article
In: Class. Quantum Grav., vol. 42, no. 22, 2025, ISSN: 1361-6382.
@article{Piccione2025d,
title = {Hybrid classical-quantum Newtonian gravity with stable vacuum},
author = {Nicolò Piccione and Angelo Bassi},
doi = {10.1088/1361-6382/ae1540},
issn = {1361-6382},
year = {2025},
date = {2025-11-21},
journal = {Class. Quantum Grav.},
volume = {42},
number = {22},
publisher = {IOP Publishing},
abstract = {Abstract
We investigate the gravitational Poissonian spontaneous localization (GPSL) model, a hybrid classical-quantum model in which classical Newtonian gravity emerges from stochastic collapses of the mass density operator, and consistently couples to quantum matter. Unlike models based on continuous weak measurement schemes, we show that GPSL ensures vacuum stability; this, together with its applicability to identical particles and fields, makes it a promising candidate for a relativistic generalization. We analyze the model’s general properties, and compare its predictions with those based on continuous weak measurement schemes. Notably, here the gravitational feedback enters entirely through the non-Hermitian jump operators, without modifying the unitary part of the dynamics. We show that this leads to a short-range gravitational back-reaction and permits decoherence rates below those of any model based on continuous weak measurement schemes. We provide explicit examples, including the dynamics of a single particle and a rigid sphere, to illustrate the distinctive phenomenology of the model. Finally, we discuss the experimental testability of GPSL, highlighting both interferometric and non-interferometric strategies to constrain its parameters and distinguish it from competing models. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
75.
Cromb, M.; Braidotti, M. C.; Vinante, A.; Faccio, D.; Ulbricht, H.
Creation of a black hole bomb instability in an electromagnetic system Journal Article
In: Sci. Adv., vol. 11, no. 45, 2025, ISSN: 2375-2548.
@article{Cromb2025,
title = {Creation of a black hole bomb instability in an electromagnetic system},
author = {M. Cromb and M.C. Braidotti and A. Vinante and D. Faccio and H. Ulbricht},
doi = {10.1126/sciadv.adz4595},
issn = {2375-2548},
year = {2025},
date = {2025-11-07},
journal = {Sci. Adv.},
volume = {11},
number = {45},
publisher = {American Association for the Advancement of Science (AAAS)},
abstract = {The amplification and generation of electromagnetic radiation by a rotating metallic or lossy cylinder, first proposed by Zel’dovich in the 1970s, is closely linked to quantum friction, energy extraction from rotating black holes, and runaway mechanisms such as black hole bombs. Although advances such as acoustic analogs of the Zel’dovich effect and the observation of negative resistance in low-frequency electromagnetic models have been reported, genuine positive signal gain, spontaneous emission of electromagnetic waves, and runaway amplification have not previously been verified. Here, we provide the first experimental demonstration that a mechanically rotating metallic cylinder acts as an amplifier of a rotating electromagnetic field mode. Moreover, when combined with a low-loss resonator, the system becomes unstable and operates as a generator seeded only by noise. The exponential runaway amplification of spontaneously generated electromagnetic modes is observed, establishing the electromagnetic analog of the Press-Teukolsky black hole bomb and paving the way to experimental tests of quantum friction from vacuum fluctuations. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
74.
Homans, Jack; Simcox, Elliot; Wardak, Jakub; da Palma Barbara, Laura; Fuchs, Tim M; Mufato, Rafael; Concepcion, Florence; Dragomir, Andrei; Vogt, Christian; Nisbet-Jones, Peter; Bridges, Christopher; Ulbricht, Hendrik
An experimental platform for levitated mechanics in space Journal Article
In: Quantum Sci. Technol., vol. 10, no. 3, 2025, ISSN: 2058-9565.
@article{Homans2025,
title = {An experimental platform for levitated mechanics in space},
author = {Jack Homans and Elliot Simcox and Jakub Wardak and Laura da Palma Barbara and Tim M Fuchs and Rafael Mufato and Florence Concepcion and Andrei Dragomir and Christian Vogt and Peter Nisbet-Jones and Christopher Bridges and Hendrik Ulbricht},
doi = {10.1088/2058-9565/ade624},
issn = {2058-9565},
year = {2025},
date = {2025-10-01},
journal = {Quantum Sci. Technol.},
volume = {10},
number = {3},
publisher = {IOP Publishing},
abstract = {Abstract
Conducting experiments in extreme conditions has long been the aim of the levitated mechanics field, as it allows for the investigation of new fundamental physics phenomena. Sending these experiments into the micro-g environment of space has been one such milestone, with multiple proposals calling for such a platform. At the same time, levitated sensors have demonstrated a high sensitivity to external stimuli, such as electric, magnetic and gravitational forces, which will only improve in low-vibrational conditions. This paper describes the development of a technology demonstrator for optical and magnetic trapping experiments in space. Our payload represents the first concrete step towards future missions with aims of probing fundamental physical questions: matter-wave interferometry of nanoparticles to probe the limits of macroscopic quantum mechanics, detection of Dark Matter candidates and gravitational waves to test physics beyond the Standard Model, and accelerometry for Earth-observation. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
73.
Barr, Jessica; Mukherjee, Shreyasi; Ferraro, Alessandro; Paternostro, Mauro; Zicari, Giorgio
A machine learning based approach to the identification of spectral densities in quantum open systems Journal Article
In: Eur. Phys. J. Spec. Top., 2025, ISSN: 1951-6401.
@article{Barr2025,
title = {A machine learning based approach to the identification of spectral densities in quantum open systems},
author = {Jessica Barr and Shreyasi Mukherjee and Alessandro Ferraro and Mauro Paternostro and Giorgio Zicari},
doi = {10.1140/epjs/s11734-025-01954-9},
issn = {1951-6401},
year = {2025},
date = {2025-09-21},
journal = {Eur. Phys. J. Spec. Top.},
publisher = {Springer Science and Business Media LLC},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
72.
Headley, Francis J
Magnetic dipole trapping potential between infinite superconducting plates Journal Article
In: Phys. Scr., vol. 100, no. 8, 2025, ISSN: 1402-4896.
@article{Headley2025,
title = {Magnetic dipole trapping potential between infinite superconducting plates},
author = {Francis J Headley},
doi = {10.1088/1402-4896/adeeda},
issn = {1402-4896},
year = {2025},
date = {2025-08-01},
journal = {Phys. Scr.},
volume = {100},
number = {8},
publisher = {IOP Publishing},
abstract = {Abstract
We derive the exact analytic form of the potential experienced by a magnetic dipole trapped between two infinite parallel superconducting plates using the method of image dipoles, providing a benchmark for numerical methods and a foundation for studying the stability and dynamics of magnetically levitated systems in precision measurements and fundamental physics experiments. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
71.
Angeli, Oliviero; Carlesso, Matteo
Entanglement in Markovian hybrid classical-quantum theories of gravity Journal Article
In: Phys. Rev. D, vol. 112, no. 2, 2025, ISSN: 2470-0029.
@article{Angeli2025,
title = {Entanglement in Markovian hybrid classical-quantum theories of gravity},
author = {Oliviero Angeli and Matteo Carlesso},
doi = {10.1103/jzht-fbwt},
issn = {2470-0029},
year = {2025},
date = {2025-07-21},
journal = {Phys. Rev. D},
volume = {112},
number = {2},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
70.
Gundhi, Anirudh; Ulbricht, Hendrik
Measuring Decoherence Due to Quantum Vacuum Fluctuations Journal Article
In: Phys. Rev. Lett., vol. 135, no. 2, 2025, ISSN: 1079-7114.
@article{Gundhi2025,
title = {Measuring Decoherence Due to Quantum Vacuum Fluctuations},
author = {Anirudh Gundhi and Hendrik Ulbricht},
doi = {10.1103/s5c9-zjt9},
issn = {1079-7114},
year = {2025},
date = {2025-07-00},
journal = {Phys. Rev. Lett.},
volume = {135},
number = {2},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
69.
Piccione, Nicolò; Bassi, Angelo
Exploring the effects of mass dependence in spontaneous collapse models Journal Article
In: Phys. Rev. A, vol. 112, no. 1, 2025, ISSN: 2469-9934.
@article{Piccione2025,
title = {Exploring the effects of mass dependence in spontaneous collapse models},
author = {Nicolò Piccione and Angelo Bassi},
doi = {10.1103/2yy5-tj85},
issn = {2469-9934},
year = {2025},
date = {2025-07-00},
journal = {Phys. Rev. A},
volume = {112},
number = {1},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
68.
Amaral, Dorian W. P.; Uitenbroek, Dennis G.; Oosterkamp, Tjerk H.; Tunnell, Christopher D.
First Search for Ultralight Dark Matter Using a Magnetically Levitated Particle Journal Article
In: Phys. Rev. Lett., vol. 134, no. 25, 2025, ISSN: 1079-7114.
@article{Amaral2025,
title = {First Search for Ultralight Dark Matter Using a Magnetically Levitated Particle},
author = {Dorian W. P. Amaral and Dennis G. Uitenbroek and Tjerk H. Oosterkamp and Christopher D. Tunnell},
doi = {10.1103/physrevlett.134.251001},
issn = {1079-7114},
year = {2025},
date = {2025-06-00},
journal = {Phys. Rev. Lett.},
volume = {134},
number = {25},
publisher = {American Physical Society (APS)},
abstract = {We perform the first search for ultralight dark matter using a magnetically levitated particle. A submillimeter permanent magnet is levitated in a superconducting trap with a measured force sensitivity of 0.2 fN / Hz B − L ( 1.10360 − 1.10485 ) × 10 − 13 eV / c 2 g B − L ≲ 2.98 × 10 − 21
Published by the American Physical Society
2025
keywords = {},
pubstate = {published},
tppubtype = {article}
}
67.
Toroš, Marko; Braidotti, Maria Chiara; Ashutosh, Swain; Paternostro, Mauro; Padgett, Miles; Faccio, Daniele
Generating quantum nonlocal entanglement with mechanical rotations Journal Article
In: Phys. Rev. Research, vol. 7, no. 3, 2025, ISSN: 2643-1564.
@article{Toroš2025,
title = {Generating quantum nonlocal entanglement with mechanical rotations},
author = {Marko Toroš and Maria Chiara Braidotti and Swain Ashutosh and Mauro Paternostro and Miles Padgett and Daniele Faccio},
doi = {10.1103/84vr-nnvs},
issn = {2643-1564},
year = {2025},
date = {2025-05-16},
journal = {Phys. Rev. Research},
volume = {7},
number = {3},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Recent experiments have searched for evidence of the impact of noninertial motion on the entanglement of particles. The success of these endeavors has been hindered by the fact that such tests were performed within spatial scales that were only “local” when compared to the spatial scales over which the noninertial motion was taking place. We propose a Sagnac-like interferometer that, by challenging such bottlenecks, is able to achieve entangled states through a mechanism induced by the mechanical rotation of a photonic interferometer. The resulting states violate the Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) inequality all the way up to the Tsirelson bound, thus signaling strong quantum nonlocality. Furthermore, we show that inequality remains violated even without using any form of postselection up to the value <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>1</a:mn><a:mo>+</a:mo><a:msqrt><a:mn>2</a:mn></a:msqrt></a:mrow></a:math>. Our results demonstrate that mechanical rotation can be thought of as resource for controlling quantum nonlocality with implications also for recent proposals for experiments that can probe the quantum nature of curved spacetimes and noninertial motion.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Recent experiments have searched for evidence of the impact of noninertial motion on the entanglement of particles. The success of these endeavors has been hindered by the fact that such tests were performed within spatial scales that were only “local” when compared to the spatial scales over which the noninertial motion was taking place. We propose a Sagnac-like interferometer that, by challenging such bottlenecks, is able to achieve entangled states through a mechanism induced by the mechanical rotation of a photonic interferometer. The resulting states violate the Bell-Clauser-Horne-Shimony-Holt (Bell-CHSH) inequality all the way up to the Tsirelson bound, thus signaling strong quantum nonlocality. Furthermore, we show that inequality remains violated even without using any form of postselection up to the value <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mn>1</a:mn><a:mo>+</a:mo><a:msqrt><a:mn>2</a:mn></a:msqrt></a:mrow></a:math>. Our results demonstrate that mechanical rotation can be thought of as resource for controlling quantum nonlocality with implications also for recent proposals for experiments that can probe the quantum nature of curved spacetimes and noninertial motion.</jats:p>
66.
Mendonça, Taysa M.; Soares-Pinto, Diogo O.; Paternostro, Mauro
Information flow-enhanced precision in collisional quantum thermometry Journal Article
In: Phys. Rev. Research, vol. 7, no. 4, 2025, ISSN: 2643-1564.
@article{Mendonça2025,
title = {Information flow-enhanced precision in collisional quantum thermometry},
author = {Taysa M. Mendonça and Diogo O. Soares-Pinto and Mauro Paternostro},
doi = {10.1103/ymjl-hpm4},
issn = {2643-1564},
year = {2025},
date = {2025-05-16},
journal = {Phys. Rev. Research},
volume = {7},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>We describe and analyze a quantum thermometer based on a multilayered collisional model. We propose a qubit system whose architecture provides significant sensitivity even for short interaction times between the ancillae that compose the thermometer probe and the system to be probed. The assessment of the flow of information taking place within the layered thermometer and between system and thermometer reveals that the tuning of the mutual backflow of information has a positive influence on the precision of thermometry, and helps unveiling the information-theoretic mechanisms behind the working principles of the proposed architecture.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>We describe and analyze a quantum thermometer based on a multilayered collisional model. We propose a qubit system whose architecture provides significant sensitivity even for short interaction times between the ancillae that compose the thermometer probe and the system to be probed. The assessment of the flow of information taking place within the layered thermometer and between system and thermometer reveals that the tuning of the mutual backflow of information has a positive influence on the precision of thermometry, and helps unveiling the information-theoretic mechanisms behind the working principles of the proposed architecture.</jats:p>
65.
Artini, Simone; Monaco, Gabriele Lo; Donadi, Sandro; Paternostro, Mauro
Nonequilibrium thermodynamics of gravitational objective-collapse models Journal Article
In: Phys. Rev. Research, vol. 7, no. 4, 2025, ISSN: 2643-1564.
@article{Artini2025,
title = {Nonequilibrium thermodynamics of gravitational objective-collapse models},
author = {Simone Artini and Gabriele Lo Monaco and Sandro Donadi and Mauro Paternostro},
doi = {10.1103/7hqd-zf96},
issn = {2643-1564},
year = {2025},
date = {2025-05-16},
journal = {Phys. Rev. Research},
volume = {7},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>We investigate the entropy production in the Diósi-Penrose (DP) model, one of the most extensively studied gravity-related collapse mechanisms, and one of its dissipative extensions. To this end, we analyze the behavior of a single harmonic oscillator, subjected to such collapse mechanisms, focusing on its phase-space dynamics and the time evolution of the entropy production rate—a central quantity in nonequilibrium thermodynamics. Our findings reveal that the original DP model induces unbounded heating, producing dynamics consistent with the second law of thermodynamics only under the assumption of an infinite-temperature noise field. In contrast, its dissipative extension achieves physically consistent thermalization in the regime of low dissipation strength. Using a short-time approach, we further our study to address the complete dynamics of the dissipative extension, thus including explicitly non-Gaussian features in the state of the system that lack from the low-dissipation regime.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>We investigate the entropy production in the Diósi-Penrose (DP) model, one of the most extensively studied gravity-related collapse mechanisms, and one of its dissipative extensions. To this end, we analyze the behavior of a single harmonic oscillator, subjected to such collapse mechanisms, focusing on its phase-space dynamics and the time evolution of the entropy production rate—a central quantity in nonequilibrium thermodynamics. Our findings reveal that the original DP model induces unbounded heating, producing dynamics consistent with the second law of thermodynamics only under the assumption of an infinite-temperature noise field. In contrast, its dissipative extension achieves physically consistent thermalization in the regime of low dissipation strength. Using a short-time approach, we further our study to address the complete dynamics of the dissipative extension, thus including explicitly non-Gaussian features in the state of the system that lack from the low-dissipation regime.</jats:p>
64.
McAleese, Hannah; Agrawal, Anuj; Vasan, Vivek; Campbell, Conall J.; Hawkins, Adam G.; Kilper, Daniel C.; Paternostro, Mauro; Ruffini, Marco
Strategies for entanglement distribution in optical fiber networks Journal Article
In: Phys. Rev. Research, vol. 7, no. 4, 2025, ISSN: 2643-1564.
@article{McAleese2025b,
title = {Strategies for entanglement distribution in optical fiber networks},
author = {Hannah McAleese and Anuj Agrawal and Vivek Vasan and Conall J. Campbell and Adam G. Hawkins and Daniel C. Kilper and Mauro Paternostro and Marco Ruffini},
doi = {10.1103/84qz-1jz2},
issn = {2643-1564},
year = {2025},
date = {2025-05-15},
journal = {Phys. Rev. Research},
volume = {7},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Distributing entanglement over long distances remains a challenge due to its fragility when exposed to environmental effects. In this work, we compare various entanglement distribution protocols in a realistic noisy fiber network. We focus specifically on two schemes that only require the sending of a nonentangled carrier photon to remote nodes of the network. These protocols rely on optical / gates, and we vary the probability with which they can be successfully performed. Encoding our entangled states in photon polarization, we analyze the effect of depolarizing noise on the photonic states as the carrier passes through the fibers. Building a robust model of photon loss and calculating the distillable entanglement of the noisy states, we find the entanglement distribution rate. We discover that methods involving a separable carrier can reach a higher rate than the standard entanglement distribution protocol, provided that the success probability of the optical / gates is sufficiently high.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Distributing entanglement over long distances remains a challenge due to its fragility when exposed to environmental effects. In this work, we compare various entanglement distribution protocols in a realistic noisy fiber network. We focus specifically on two schemes that only require the sending of a nonentangled carrier photon to remote nodes of the network. These protocols rely on optical / gates, and we vary the probability with which they can be successfully performed. Encoding our entangled states in photon polarization, we analyze the effect of depolarizing noise on the photonic states as the carrier passes through the fibers. Building a robust model of photon loss and calculating the distillable entanglement of the noisy states, we find the entanglement distribution rate. We discover that methods involving a separable carrier can reach a higher rate than the standard entanglement distribution protocol, provided that the success probability of the optical / gates is sufficiently high.</jats:p>
63.
McAleese, Hannah; Paternostro, Mauro; Puebla, Ricardo
Engineering nonlinear boson-boson interactions using mediating spin systems Journal Article
In: Phys. Rev. Research, vol. 7, no. 2, 2025, ISSN: 2643-1564.
@article{McAleese2025,
title = {Engineering nonlinear boson-boson interactions using mediating spin systems},
author = {Hannah McAleese and Mauro Paternostro and Ricardo Puebla},
doi = {10.1103/physrevresearch.7.023253},
issn = {2643-1564},
year = {2025},
date = {2025-05-08},
journal = {Phys. Rev. Research},
volume = {7},
number = {2},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>We present a protocol to create entangled coherent states by engineering cross-Kerr interactions between bosonic systems endowed with (externally driven) internal spin-like degrees of freedom. With slight modifications, the protocol is also able to produce N00N states through nonlinear beam-splitter interactions. Each bosonic system interacts locally with its spin and by suitably tuning the model parameters, various classes of effective bosonic interaction Hamiltonians, mediated by the coupled spins, can be engineered. Our approach is benchmarked by numerical simulations aimed at studying the entanglement within a bosonic register and comparing it with the expected one resulting from the target Hamiltonians.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>We present a protocol to create entangled coherent states by engineering cross-Kerr interactions between bosonic systems endowed with (externally driven) internal spin-like degrees of freedom. With slight modifications, the protocol is also able to produce N00N states through nonlinear beam-splitter interactions. Each bosonic system interacts locally with its spin and by suitably tuning the model parameters, various classes of effective bosonic interaction Hamiltonians, mediated by the coupled spins, can be engineered. Our approach is benchmarked by numerical simulations aimed at studying the entanglement within a bosonic register and comparing it with the expected one resulting from the target Hamiltonians.</jats:p>
62.
Leedumrongwatthanakun, Saroch; Innocenti, Luca; Ferraro, Alessandro; Paternostro, Mauro; Gigan, Sylvain
Classification of quantum states of light using random measurements through a multimode fiber Journal Article
In: Phys. Rev. Research, vol. 7, no. 2, 2025, ISSN: 2643-1564.
@article{Leedumrongwatthanakun2025,
title = {Classification of quantum states of light using random measurements through a multimode fiber},
author = {Saroch Leedumrongwatthanakun and Luca Innocenti and Alessandro Ferraro and Mauro Paternostro and Sylvain Gigan},
doi = {10.1103/physrevresearch.7.023222},
issn = {2643-1564},
year = {2025},
date = {2025-05-06},
journal = {Phys. Rev. Research},
volume = {7},
number = {2},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Extracting meaningful information about unknown quantum states without performing a full tomography is an important task. Low-dimensional projections and random measurements can provide such insight but typically require careful crafting. In this paper, we present an optical scheme based on sending unknown input states through a multimode fiber and performing two-point intensity and coincidence measurements. A short multimode fiber implements effectively a random projection in the spatial domain, while a long-dispersive multimode fiber performs a spatial and spectral projection. We experimentally show that useful properties, i.e., the purity, dimensionality, and degree of indistinguishability of various states of light including spectrally entangled biphoton states, can be obtained by measuring statistical properties of single counts and their correlation between two outputs over many realizations of unknown random projections. Moreover, we show that this information can then be used for state classification.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Extracting meaningful information about unknown quantum states without performing a full tomography is an important task. Low-dimensional projections and random measurements can provide such insight but typically require careful crafting. In this paper, we present an optical scheme based on sending unknown input states through a multimode fiber and performing two-point intensity and coincidence measurements. A short multimode fiber implements effectively a random projection in the spatial domain, while a long-dispersive multimode fiber performs a spatial and spectral projection. We experimentally show that useful properties, i.e., the purity, dimensionality, and degree of indistinguishability of various states of light including spectrally entangled biphoton states, can be obtained by measuring statistical properties of single counts and their correlation between two outputs over many realizations of unknown random projections. Moreover, we show that this information can then be used for state classification.</jats:p>
61.
Pfeifer, Christian; Rätzel, Dennis; Braun, Daniel
Gravitational attraction of ultrarelativistic matter: A new testbed for modified gravity at the Large Hadron Collider Journal Article
In: Phys. Rev. D, vol. 111, no. 8, 2025, ISSN: 2470-0029.
@article{Pfeifer2025,
title = {Gravitational attraction of ultrarelativistic matter: A new testbed for modified gravity at the Large Hadron Collider},
author = {Christian Pfeifer and Dennis Rätzel and Daniel Braun},
doi = {10.1103/physrevd.111.084073},
issn = {2470-0029},
year = {2025},
date = {2025-04-00},
journal = {Phys. Rev. D},
volume = {111},
number = {8},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
60.
Ahrens, Felix; Ji, Wei; Budker, Dmitry; Timberlake, Chris; Ulbricht, Hendrik; Vinante, Andrea
Levitated Ferromagnetic Magnetometer with Energy Resolution Well Below
In: Phys. Rev. Lett., vol. 134, no. 11, 2025, ISSN: 1079-7114.
@article{Ahrens2025,
title = {Levitated Ferromagnetic Magnetometer with Energy Resolution Well Below
ℏ
author = {Felix Ahrens and Wei Ji and Dmitry Budker and Chris Timberlake and Hendrik Ulbricht and Andrea Vinante},
doi = {10.1103/physrevlett.134.110801},
issn = {1079-7114},
year = {2025},
date = {2025-03-00},
journal = {Phys. Rev. Lett.},
volume = {134},
number = {11},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
59.
Muffato, R.; Georgescu, T. S.; Homans, J.; Guerreiro, T.; Wu, Q.; Chisholm, D. A.; Carlesso, M.; Paternostro, M.; Ulbricht, H.
Generation of classical non-Gaussian states by squeezing a thermal state into nonlinear motion of levitated optomechanics Journal Article
In: Phys. Rev. Research, vol. 7, no. 1, 2025, ISSN: 2643-1564.
@article{Muffato2025,
title = {Generation of classical non-Gaussian states by squeezing a thermal state into nonlinear motion of levitated optomechanics},
author = {R. Muffato and T. S. Georgescu and J. Homans and T. Guerreiro and Q. Wu and D. A. Chisholm and M. Carlesso and M. Paternostro and H. Ulbricht},
doi = {10.1103/physrevresearch.7.013171},
issn = {2643-1564},
year = {2025},
date = {2025-02-00},
journal = {Phys. Rev. Research},
volume = {7},
number = {1},
publisher = {American Physical Society (APS)},
abstract = {We report on an experiment achieving the dynamical generation of non-Gaussian states of motion of a levitated optomechanical system. We access intrinsic Duffing-like nonlinearities by thermal squeezing of an oscillator's state of motion by rapidly switching the frequency of its trap. We characterize the experimental non-Gaussian state versus expectations from simulations and give prospects for the emergence of genuine nonclassical features.
Published by the American Physical Society
2025
keywords = {},
pubstate = {published},
tppubtype = {article}
}
58.
Altamura, Davide Giordano Ario; Vinante, Andrea; Carlesso, Matteo
Improved bounds on collapse models from rotational noise of the Laser Interferometer Space Antenna Pathfinder mission Journal Article
In: Phys. Rev. A, vol. 111, no. 2, 2025, ISSN: 2469-9934.
@article{Altamura2025,
title = {Improved bounds on collapse models from rotational noise of the Laser Interferometer Space Antenna Pathfinder mission},
author = {Davide Giordano Ario Altamura and Andrea Vinante and Matteo Carlesso},
doi = {10.1103/physreva.111.l020203},
issn = {2469-9934},
year = {2025},
date = {2025-02-00},
journal = {Phys. Rev. A},
volume = {111},
number = {2},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
57.
Bose, Sougato; Fuentes, Ivette; Geraci, Andrew A.; Khan, Saba Mehsar; Qvarfort, Sofia; Rademacher, Markus; Rashid, Muddassar; Toroš, Marko; Ulbricht, Hendrik; Wanjura, Clara C.
Massive quantum systems as interfaces of quantum mechanics and gravity Journal Article
In: Rev. Mod. Phys., vol. 97, no. 1, 2025, ISSN: 1539-0756.
@article{Bose2025,
title = {Massive quantum systems as interfaces of quantum mechanics and gravity},
author = {Sougato Bose and Ivette Fuentes and Andrew A. Geraci and Saba Mehsar Khan and Sofia Qvarfort and Markus Rademacher and Muddassar Rashid and Marko Toroš and Hendrik Ulbricht and Clara C. Wanjura},
doi = {10.1103/revmodphys.97.015003},
issn = {1539-0756},
year = {2025},
date = {2025-02-00},
journal = {Rev. Mod. Phys.},
volume = {97},
number = {1},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
56.
Crognaletti, Giulio; Bartolomeo, Giovanni Di; Vischi, Michele; Viteritti, Luciano Loris
Equivariant Variational Quantum Eigensolver to detect phase transitions through energy level crossings Journal Article
In: Quantum Sci. Technol., vol. 10, no. 1, 2025, ISSN: 2058-9565.
@article{Crognaletti2024,
title = {Equivariant Variational Quantum Eigensolver to detect phase transitions through energy level crossings},
author = {Giulio Crognaletti and Giovanni Di Bartolomeo and Michele Vischi and Luciano Loris Viteritti},
doi = {10.1088/2058-9565/ad9be3},
issn = {2058-9565},
year = {2025},
date = {2025-01-01},
journal = {Quantum Sci. Technol.},
volume = {10},
number = {1},
publisher = {IOP Publishing},
abstract = {Abstract
Level spectroscopy stands as a powerful method for identifying the transition point that delineates distinct quantum phases. Since each quantum phase exhibits a characteristic sequence of excited states, the crossing of energy levels between low-lying excited states offers a reliable mean to estimate the phase transition point. While approaches like the Variational Quantum Eigensolver are useful for approximating ground states of interacting systems using quantum computing, capturing low-energy excitations remains challenging. In our study, we introduce an equivariant quantum circuit that preserves the total spin and the translational symmetry to accurately describe singlet and triplet excited states in the J
1 –J
2 Heisenberg model on a chain, which are crucial for characterizing its transition point. Additionally, we assess the impact of noise on the variational state, showing that conventional mitigation techniques like Zero Noise Extrapolation reliably restore its physical properties. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
55.
Monaco, Gabriele Lo; Innocenti, Luca; Cilluffo, Dario; Chisholm, Diana A; Lorenzo, Salvatore; Palma, G Massimo
An operational definition of quantum information scrambling Journal Article
In: Quantum Sci. Technol., vol. 10, no. 1, 2025, ISSN: 2058-9565.
@article{LoMonaco2024,
title = {An operational definition of quantum information scrambling},
author = {Gabriele Lo Monaco and Luca Innocenti and Dario Cilluffo and Diana A Chisholm and Salvatore Lorenzo and G Massimo Palma},
doi = {10.1088/2058-9565/ad9ed2},
issn = {2058-9565},
year = {2025},
date = {2025-01-01},
journal = {Quantum Sci. Technol.},
volume = {10},
number = {1},
publisher = {IOP Publishing},
abstract = {Abstract
Quantum information scrambling (QIS) is a characteristic feature of several quantum systems, ranging from black holes to quantum communication networks. While accurately quantifying QIS is crucial to understanding many such phenomena, common approaches based on the tripartite information have limitations due to the accessibility issues of quantum mutual information, and do not always properly take into consideration the dependence on the encoding input basis. To address these issues, we propose a novel and computationally efficient QIS quantifier, based on a formulation of QIS in terms of quantum state discrimination. We show that the optimal guessing probability, which reflects the degree of QIS induced by an isometric quantum evolution, is directly connected to the accessible min-information , a generalized channel capacity based on conditional min-entropy, which can be cast as a convex program and thus computed efficiently. By applying our proposal to a range of examples with increasing complexity, we illustrate its ability to capture the multifaceted nature of QIS in all its intricacy. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2024
54.
Mukherjee, Shreyasi; Penna, Dario; Cirinnà, Fabio; Paternostro, Mauro; Paladino, Elisabetta; Falci, Giuseppe; Giannelli, Luigi
Noise classification in three-level quantum networks by Machine Learning Journal Article
In: Mach. Learn.: Sci. Technol., vol. 5, no. 4, 2024, ISSN: 2632-2153.
@article{Mukherjee2024,
title = {Noise classification in three-level quantum networks by Machine Learning},
author = {Shreyasi Mukherjee and Dario Penna and Fabio Cirinnà and Mauro Paternostro and Elisabetta Paladino and Giuseppe Falci and Luigi Giannelli},
doi = {10.1088/2632-2153/ad9193},
issn = {2632-2153},
year = {2024},
date = {2024-12-01},
journal = {Mach. Learn.: Sci. Technol.},
volume = {5},
number = {4},
publisher = {IOP Publishing},
abstract = {Abstract
We investigate a machine learning based classification of noise acting on a small quantum network with the aim of detecting spatial or multilevel correlations, and the interplay with Markovianity. We control a three-level system by inducing coherent population transfer exploiting different pulse amplitude combinations as inputs to train a feedforward neural network. We show that supervised learning can classify different types of classical dephasing noise affecting the system. Three non-Markovian (quasi-static correlated, anti-correlated and uncorrelated) and Markovian noises are classified with more than 99% accuracy. On the contrary, correlations of Markovian noise cannot be discriminated with our method. Our approach is robust to statistical measurement errors and retains its effectiveness for physical measurements where only a limited number of samples is available making it very experimental-friendly. Our result paves the way for classifying spatial correlations of noise in quantum architectures. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
53.
Sgroi, S.; Zicari, G.; Imparato, A.; Paternostro, M.
Efficient excitation-transfer across fully connected networks via local-energy optimization Journal Article
In: EPJ Quantum Technol., vol. 11, no. 1, 2024, ISSN: 2196-0763.
@article{Sgroi2024,
title = {Efficient excitation-transfer across fully connected networks via local-energy optimization},
author = {S. Sgroi and G. Zicari and A. Imparato and M. Paternostro},
doi = {10.1140/epjqt/s40507-024-00238-w},
issn = {2196-0763},
year = {2024},
date = {2024-12-00},
journal = {EPJ Quantum Technol.},
volume = {11},
number = {1},
publisher = {Springer Science and Business Media LLC},
abstract = {Abstract We study the excitation transfer across a fully connected quantum network whose sites energies can be artificially designed. Starting from a simplified model of a broadly-studied physical system, we systematically optimize its local energies to achieve high excitation transfer for various environmental conditions, using an adaptive Gradient Descent technique and Automatic Differentiation. We show that almost perfect transfer can be achieved with and without local dephasing, provided that the dephasing rates are not too large. We investigate our solutions in terms of resilience against variations in either the network connection strengths, or size, as well as coherence losses. We highlight the different features of a dephasing-free and dephasing-driven transfer. Our work gives further insight into the interplay between coherence and dephasing effects in excitation-transfer phenomena across fully connected quantum networks. In turn, this will help designing optimal transfer in artificial open networks through the simple manipulation of local energies. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
52.
Braidotti, M. C.; Vinante, A.; Cromb, M.; Sandakumar, A.; Faccio, D.; Ulbricht, H.
Amplification of electromagnetic fields by a rotating body Journal Article
In: Nat Commun, vol. 15, no. 1, 2024, ISSN: 2041-1723.
@article{Braidotti2024,
title = {Amplification of electromagnetic fields by a rotating body},
author = {M. C. Braidotti and A. Vinante and M. Cromb and A. Sandakumar and D. Faccio and H. Ulbricht},
doi = {10.1038/s41467-024-49689-w},
issn = {2041-1723},
year = {2024},
date = {2024-12-00},
journal = {Nat Commun},
volume = {15},
number = {1},
publisher = {Springer Science and Business Media LLC},
abstract = {Abstract In 1971, Zel’dovich predicted the amplification of electromagnetic (EM) waves scattered by a rotating metallic cylinder, gaining mechanical rotational energy from the body. This phenomenon was believed to be unobservable with electromagnetic fields due to technological difficulties in meeting the condition of amplification that is, the cylinder must rotate faster than the frequency of the incoming radiation. Here, we measure the amplification of an electromagnetic field, generated by a toroid LC-circuit, scattered by an aluminium cylinder spinning in the toroid gap. We show that when the Zel’dovich condition is met, the resistance induced by the cylinder becomes negative implying amplification of the incoming EM fields. These results reveal the connection between the concept of induction generators and the physics of this fundamental physics effect and open new prospects towards testing the Zel’dovich mechanism in the quantum regime, as well as related quantum friction effects. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
51.
Gundhi, Anirudh
Decoherence due to the Casimir effect? Journal Article
In: Phys. Rev. D, vol. 110, no. 11, 2024, ISSN: 2470-0029.
@article{Gundhi2024,
title = {Decoherence due to the Casimir effect?},
author = {Anirudh Gundhi},
doi = {10.1103/physrevd.110.116001},
issn = {2470-0029},
year = {2024},
date = {2024-12-00},
journal = {Phys. Rev. D},
volume = {110},
number = {11},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
50.
Bartolomeo, Giovanni Di; Vischi, Michele; Feri, Tommaso; Bassi, Angelo; Donadi, Sandro
Efficient quantum algorithm to simulate open systems through a single environmental qubit Journal Article
In: Phys. Rev. Research, vol. 6, no. 4, 2024, ISSN: 2643-1564.
@article{DiBartolomeo2024b,
title = {Efficient quantum algorithm to simulate open systems through a single environmental qubit},
author = {Giovanni Di Bartolomeo and Michele Vischi and Tommaso Feri and Angelo Bassi and Sandro Donadi},
doi = {10.1103/physrevresearch.6.043321},
issn = {2643-1564},
year = {2024},
date = {2024-12-00},
journal = {Phys. Rev. Research},
volume = {6},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {We present an efficient algorithm for simulating open quantum systems dynamics described by the Lindblad master equation on quantum computers, addressing key challenges in the field. In contrast to existing approaches, our method achieves two significant advancements. First, we employ a repetition of unitary gates on a set of n m m n
Published by the American Physical Society
2024
keywords = {},
pubstate = {published},
tppubtype = {article}
}
49.
Hernández-Gómez, Santiago; Isogawa, Takuya; Belenchia, Alessio; Levy, Amikam; Fabbri, Nicole; Gherardini, Stefano; Cappellaro, Paola
Interferometry of quantum correlation functions to access quasiprobability distribution of work Journal Article
In: npj Quantum Inf, vol. 10, no. 1, 2024, ISSN: 2056-6387.
@article{Hernández-Gómez2024,
title = {Interferometry of quantum correlation functions to access quasiprobability distribution of work},
author = {Santiago Hernández-Gómez and Takuya Isogawa and Alessio Belenchia and Amikam Levy and Nicole Fabbri and Stefano Gherardini and Paola Cappellaro},
doi = {10.1038/s41534-024-00913-x},
issn = {2056-6387},
year = {2024},
date = {2024-12-00},
journal = {npj Quantum Inf},
volume = {10},
number = {1},
publisher = {Springer Science and Business Media LLC},
abstract = {Abstract The Kirkwood-Dirac quasiprobability distribution, intimately connected with the quantum correlation function of two observables measured at distinct times, is becoming increasingly relevant for fundamental physics and quantum technologies. This quasiprobability distribution can take non-positive values, and its experimental reconstruction becomes challenging when expectation values of incompatible observables are involved. Here, we use an interferometric scheme aided by an auxiliary system to reconstruct the Kirkwood-Dirac quasiprobability distribution. We experimentally demonstrate this scheme in an electron-nuclear spin system associated with a nitrogen-vacancy center in diamond. By measuring the characteristic function, we reconstruct the quasiprobability distribution of work and analyze the behavior of its first and second moments. Our results clarify the physical meaning of the work quasiprobability distribution in the context of quantum thermodynamics. Finally, we study the uncertainty of measuring the Hamiltonian of the system at two times, via the Robertson-Schrödinger uncertainty relation, for different initial states. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
48.
Lenler-Eriksen, Emil; Drewsen, Michael; Carlesso, Matteo
Testing continuous spontaneous localization model with charged macromolecules Journal Article
In: New J. Phys., vol. 26, no. 11, 2024, ISSN: 1367-2630.
@article{Lenler-Eriksen2024,
title = {Testing continuous spontaneous localization model with charged macromolecules},
author = {Emil Lenler-Eriksen and Michael Drewsen and Matteo Carlesso},
doi = {10.1088/1367-2630/ad904a},
issn = {1367-2630},
year = {2024},
date = {2024-11-01},
journal = {New J. Phys.},
volume = {26},
number = {11},
publisher = {IOP Publishing},
abstract = {Abstract
In the last decade, a growing interest has been devoted to models of spontaneous collapse of the wavefunction, known also as collapse models. They coherently solve the well-known quantum measurement problem by suitably modifying the Schrödinger evolution. Quantum experiments are now finally within the reach of testing such models (and thus testing the limits of quantum theory). Here, we propose a method based on a two-ions confined in a linear Paul trap to possibly enhance the testing capabilities of such experiments. The combination of an atomic and a macromolecular ion provide a good match for the cooling of the motional degrees of freedom and a non-negligible insight in the collapse mechanism, respectively. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
47.
Figurato, Laria; Dirindin, Marco; Gaona-Reyes, José Luis; Carlesso, Matteo; Bassi, Angelo; Donadi, Sandro
On the effectiveness of the collapse in the Diósi–Penrose model Journal Article
In: New J. Phys., vol. 26, no. 11, 2024, ISSN: 1367-2630.
@article{Figurato2024c,
title = {On the effectiveness of the collapse in the Diósi–Penrose model},
author = {Laria Figurato and Marco Dirindin and José Luis Gaona-Reyes and Matteo Carlesso and Angelo Bassi and Sandro Donadi},
doi = {10.1088/1367-2630/ad8c77},
issn = {1367-2630},
year = {2024},
date = {2024-11-01},
journal = {New J. Phys.},
volume = {26},
number = {11},
publisher = {IOP Publishing},
abstract = {Abstract
The possibility that gravity plays a role in the collapse of the quantum wave function has been considered in the literature, and it is of relevance not only because it would provide a solution to the measurement problem in quantum theory, but also because it would give a new and unexpected twist to the search for a unified theory of quantum and gravitational phenomena, possibly overcoming the current impasse. The Diósi–Penrose model is the most popular incarnation of this idea. It predicts a progressive breakdown of quantum superpositions when the mass of the system increases; as such, it is susceptible to experimental verification. Current experiments set a lower bound
R
0
≳
4
R
0
≲
10
6
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
46.
Ciszak, Marzena; Belenchia, Alessio; Ortolan, Antonello; Marino, Francesco
Quantum gravity inspired nonlocal quantum dynamics preserving the classical limit Journal Article
In: Class. Quantum Grav., vol. 41, no. 20, 2024, ISSN: 1361-6382.
@article{Ciszak2024,
title = {Quantum gravity inspired nonlocal quantum dynamics preserving the classical limit},
author = {Marzena Ciszak and Alessio Belenchia and Antonello Ortolan and Francesco Marino},
doi = {10.1088/1361-6382/ad7774},
issn = {1361-6382},
year = {2024},
date = {2024-10-17},
journal = {Class. Quantum Grav.},
volume = {41},
number = {20},
publisher = {IOP Publishing},
abstract = {Abstract
Several approaches to quantum gravity lead to nonlocal modifications of fields’ dynamics. This, in turn, can give rise to nonlocal modifications of quantum mechanics at non-relativistic energies. Here, we analyze the nonlocal Schrödinger evolution of a quantum harmonic oscillator in one such scenario, where the problem can be addressed without the use of perturbation theory. We demonstrate that although deviations from standard quantum predictions occur at low occupation numbers, where they could potentially be detected or constrained by high-precision experiments, the classical limits of quantum probability densities and free energy remain unaffected up to energies comparable with the nonlocality scale. These results provide an example of nonlocal quantum dynamics compatible with classical predictions, suggesting massive quantum objects as a promising avenue for testing some phenomenological aspects of quantum gravity. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
45.
Hanif, Farhan; Das, Debarshi; Halliwell, Jonathan; Home, Dipankar; Mazumdar, Anupam; Ulbricht, Hendrik; Bose, Sougato
Testing Whether Gravity Acts as a Quantum Entity When Measured Journal Article
In: Phys. Rev. Lett., vol. 133, no. 18, 2024, ISSN: 1079-7114.
@article{Hanif2024,
title = {Testing Whether Gravity Acts as a Quantum Entity When Measured},
author = {Farhan Hanif and Debarshi Das and Jonathan Halliwell and Dipankar Home and Anupam Mazumdar and Hendrik Ulbricht and Sougato Bose},
doi = {10.1103/physrevlett.133.180201},
issn = {1079-7114},
year = {2024},
date = {2024-10-00},
journal = {Phys. Rev. Lett.},
volume = {133},
number = {18},
publisher = {American Physical Society (APS)},
abstract = {A defining signature of classical systems is “in principle measurability” without disturbance: a feature manifestly violated by quantum systems. We describe a multi-interferometer experimental setup that can, in principle, reveal the nonclassicality of a spatial superposition-sourced gravitational field if an irreducible disturbance is caused by a measurement of gravity. While one interferometer sources the field, the others are used to measure the gravitational field created by the superposition. This requires neither any specific form of nonclassical gravity, nor the generation of entanglement between any relevant degrees of freedom at any stage, thus distinguishing it from the experiments proposed so far. This test, when added to the recent entanglement-witness based proposals, enlarges the domain of quantum postulates being tested for gravity. Moreover, the proposed test yields a signature of quantum measurement induced disturbance for any finite rate of decoherence, and is device independent.
Published by the American Physical Society
2024
keywords = {},
pubstate = {published},
tppubtype = {article}
}
44.
Timberlake, Chris; Simcox, Elliot; Ulbricht, Hendrik
Linear cooling of a levitated micromagnetic cylinder by vibration Journal Article
In: Phys. Rev. Research, vol. 6, no. 3, 2024, ISSN: 2643-1564.
@article{Timberlake2024,
title = {Linear cooling of a levitated micromagnetic cylinder by vibration},
author = {Chris Timberlake and Elliot Simcox and Hendrik Ulbricht},
doi = {10.1103/physrevresearch.6.033345},
issn = {2643-1564},
year = {2024},
date = {2024-09-00},
journal = {Phys. Rev. Research},
volume = {6},
number = {3},
publisher = {American Physical Society (APS)},
abstract = {We report feedback cooling of translational and librational degrees of freedom of a levitated m icromagnet cylinder, utilizing a piezoelectric actuator to apply linear feedback to high-Q mechanical modes. The normal modes are measured with a superconducting pick-up coil coupled to a dc SQUID, and phase information is fed back to the piezoelectric actuator to feedback cool a center-of-mass mode to ∼ 7 K 830 ± 200 mK 1.0 × 10 7
Published by the American Physical Society
2024
keywords = {},
pubstate = {published},
tppubtype = {article}
}
43.
Wu, Qiongyuan; Chisholm, Diana A; Muffato, Rafael; Georgescu, Tiberius; Homans, Jack; Ulbricht, Hendrik; Carlesso, Matteo; Paternostro, Mauro
Squeezing below the ground state of motion of a continuously monitored levitating nanoparticle Journal Article
In: Quantum Sci. Technol., 2024, ISSN: 2058-9565.
@article{Wu2024,
title = {Squeezing below the ground state of motion of a continuously monitored levitating nanoparticle},
author = {Qiongyuan Wu and Diana A Chisholm and Rafael Muffato and Tiberius Georgescu and Jack Homans and Hendrik Ulbricht and Matteo Carlesso and Mauro Paternostro},
doi = {10.1088/2058-9565/ad7284},
issn = {2058-9565},
year = {2024},
date = {2024-08-22},
journal = {Quantum Sci. Technol.},
publisher = {IOP Publishing},
abstract = {Abstract
Squeezing is a crucial resource for quantum information processing and quantum sensing. In levitated nanomechanics, squeezed states of motion can be generated via temporal control of the trapping frequency of a massive particle. However, the amount of achievable squeezing typically suffers from detrimental environmental effects. We analyze the performance of a scheme that, by embedding careful time-control of trapping potentials and fully accounting for the most relevant sources of noise – including measurement backaction – achieves significant levels of mechanical squeezing. The feasibility of our proposal, which is close to experimental state-of-the-art, makes it a valuable tool for quantum state engineering. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
42.
Belenchia, Alessio; Spengler, Felix; Rätzel, Dennis; Braun, Daniel
Non-linear media in weakly curved spacetime: optical solitons and probe pulses for gravimetry Journal Article
In: New J. Phys., vol. 26, no. 8, 2024, ISSN: 1367-2630.
@article{Belenchia2024,
title = {Non-linear media in weakly curved spacetime: optical solitons and probe pulses for gravimetry},
author = {Alessio Belenchia and Felix Spengler and Dennis Rätzel and Daniel Braun},
doi = {10.1088/1367-2630/ad678d},
issn = {1367-2630},
year = {2024},
date = {2024-08-01},
journal = {New J. Phys.},
volume = {26},
number = {8},
publisher = {IOP Publishing},
abstract = {Abstract
That light propagating in a gravitational field gets frequency-shifted is one of the basic consequences of any metric theory of gravity rooted in the equivalence principle. At the same time, also a time dependent material’s refractive index can frequency-shift light propagating in it. The mathematical analogy between the two effects is such that the latter has been used to study the optical analogue of a black-hole spacetime. Here, we combine these two effects by showing that light propagation in non-linear media in the presence of a moving refractive index perturbation can lead to a gravity-dependent blueshift. We find that the predicted blueshift surpasses the gravitational redshift even if the medium is considered to be perfectly stiff. In realistic scenarios, by far the strongest frequency shift arises due to the deformation of the dielectric medium and the corresponding photoelastic change of refractive index. This has the potential to facilitate optical sensing of small gravity gradients. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
41.
Janse, Martijn; Uitenbroek, Dennis G.; van Everdingen, Loek; Plugge, Jaimy; Hensen, Bas; Oosterkamp, Tjerk H.
Current experimental upper bounds on spacetime diffusion Journal Article
In: Phys. Rev. Research, vol. 6, no. 3, 2024, ISSN: 2643-1564.
@article{Janse2024,
title = {Current experimental upper bounds on spacetime diffusion},
author = {Martijn Janse and Dennis G. Uitenbroek and Loek van Everdingen and Jaimy Plugge and Bas Hensen and Tjerk H. Oosterkamp},
doi = {10.1103/physrevresearch.6.033076},
issn = {2643-1564},
year = {2024},
date = {2024-07-00},
journal = {Phys. Rev. Research},
volume = {6},
number = {3},
publisher = {American Physical Society (APS)},
abstract = {A theory describing the dynamics of quantum systems interacting on a classical spacetime was recently put forward by Oppenheim Quantum states may retain their coherence, at the cost of some amount of stochasticity of the spacetime metric, characterized by a spacetime diffusion parameter. Here, we report existing experimental upper bounds on such spacetime diffusion, based on a review of several types of experiments with very low force noise over a broad range of test masses from single atoms to several kilograms. We find an upper bound at least 15 orders of magnitude lower as compared to the initial bounds for explicit models presented by Oppenheim . The results presented here provide a path forward for future experiments that can help evaluate classical-quantum theories.
Published by the American Physical Society
2024
keywords = {},
pubstate = {published},
tppubtype = {article}
}
40.
Altamura, Davide Giordano Ario; Carlesso, Matteo; Donadi, Sandro; Bassi, Angelo
In: Phys. Rev. A, vol. 109, no. 6, 2024, ISSN: 2469-9934.
@article{Altamura2024,
title = {Noninterferometric rotational test of the continuous spontaneous localization model: Enhancement of the collapse noise through shape optimization},
author = {Davide Giordano Ario Altamura and Matteo Carlesso and Sandro Donadi and Angelo Bassi},
doi = {10.1103/physreva.109.062212},
issn = {2469-9934},
year = {2024},
date = {2024-06-00},
journal = {Phys. Rev. A},
volume = {109},
number = {6},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
39.
Piscicchia, Kristian; Donadi, Sandro; Manti, Simone; Bassi, Angelo; Derakhshani, Maaneli; Diósi, Lajos; Curceanu, Catalina
X-Ray Emission from Atomic Systems Can Distinguish between Prevailing Dynamical Wave-Function Collapse Models Journal Article
In: Phys. Rev. Lett., vol. 132, no. 25, 2024, ISSN: 1079-7114.
@article{Piscicchia2024,
title = {X-Ray Emission from Atomic Systems Can Distinguish between Prevailing Dynamical Wave-Function Collapse Models},
author = {Kristian Piscicchia and Sandro Donadi and Simone Manti and Angelo Bassi and Maaneli Derakhshani and Lajos Diósi and Catalina Curceanu},
doi = {10.1103/physrevlett.132.250203},
issn = {1079-7114},
year = {2024},
date = {2024-06-00},
journal = {Phys. Rev. Lett.},
volume = {132},
number = {25},
publisher = {American Physical Society (APS)},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
38.
McAleese, Hannah; Paternostro, Mauro
Critical Assessment of Information Back-Flow in Measurement-Free Teleportation Journal Article
In: Entropy, vol. 26, no. 9, 2024, ISSN: 1099-4300.
@article{McAleese2024,
title = {Critical Assessment of Information Back-Flow in Measurement-Free Teleportation},
author = {Hannah McAleese and Mauro Paternostro},
doi = {10.3390/e26090780},
issn = {1099-4300},
year = {2024},
date = {2024-05-29},
journal = {Entropy},
volume = {26},
number = {9},
publisher = {MDPI AG},
abstract = {<jats:p>We assess a scheme for measurement-free quantum teleportation from the perspective of the resources underpinning its performance. In particular, we focus on claims recently made about the crucial role played by the degree of non-Markovianity of the dynamics of the information carrier whose state we aim to teleport. We prove that any link between the efficiency of teleportation and the back-flow of information depends fundamentally on the way the various operations entailed by the measurement-free teleportation protocol are implemented while—in general—no claim of causal link can be made. Our result reinforces the need for the explicit assessment of the underlying physical platform when assessing the performance and resources for a given quantum protocol and the need for a rigorous quantum resource theory of non-Markovianity.</jats:p>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>We assess a scheme for measurement-free quantum teleportation from the perspective of the resources underpinning its performance. In particular, we focus on claims recently made about the crucial role played by the degree of non-Markovianity of the dynamics of the information carrier whose state we aim to teleport. We prove that any link between the efficiency of teleportation and the back-flow of information depends fundamentally on the way the various operations entailed by the measurement-free teleportation protocol are implemented while—in general—no claim of causal link can be made. Our result reinforces the need for the explicit assessment of the underlying physical platform when assessing the performance and resources for a given quantum protocol and the need for a rigorous quantum resource theory of non-Markovianity.</jats:p>
37.
Chisholm, Diana A.; Innocenti, Luca; Palma, G. Massimo
Importance of using the averaged mutual information when quantifying quantum objectivity Journal Article
In: Phys. Rev. A, vol. 110, no. 1, 2024, ISSN: 2469-9934.
@article{Chisholm2024,
title = {Importance of using the averaged mutual information when quantifying quantum objectivity},
author = {Diana A. Chisholm and Luca Innocenti and G. Massimo Palma},
doi = {10.1103/physreva.110.012218},
issn = {2469-9934},
year = {2024},
date = {2024-05-24},
journal = {Phys. Rev. A},
volume = {110},
number = {1},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>In the context of quantum objectivity, a standard way to quantify the classicality of a state is via the mutual information between a system and different fractions of its environment. Many of the tools developed in the relevant literature to quantify quantum objectivity via quantum mutual information rely on the assumption that information about the system leaks symmetrically into its environment. In this work, we highlight the importance of taking this assumption into account, and in particular, we analyze how taking nonaveraged quantum mutual information as a quantifier of quantum objectivity can be severely misleading whenever information about the system is encoded into the environment in a nonhomogeneous way. On the other hand, the averaged mutual information always provides results with a clear operative interpretation.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>In the context of quantum objectivity, a standard way to quantify the classicality of a state is via the mutual information between a system and different fractions of its environment. Many of the tools developed in the relevant literature to quantify quantum objectivity via quantum mutual information rely on the assumption that information about the system leaks symmetrically into its environment. In this work, we highlight the importance of taking this assumption into account, and in particular, we analyze how taking nonaveraged quantum mutual information as a quantifier of quantum objectivity can be severely misleading whenever information about the system is encoded into the environment in a nonhomogeneous way. On the other hand, the averaged mutual information always provides results with a clear operative interpretation.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
36.
Hernández-Gómez, Santiago; Gherardini, Stefano; Belenchia, Alessio; Lostaglio, Matteo; Levy, Amikam; Fabbri, Nicole
Projective measurements can probe nonclassical work extraction and time correlations Journal Article
In: Phys. Rev. Research, vol. 6, no. 2, 2024, ISSN: 2643-1564.
@article{Hernández-Gómez2024b,
title = {Projective measurements can probe nonclassical work extraction and time correlations},
author = {Santiago Hernández-Gómez and Stefano Gherardini and Alessio Belenchia and Matteo Lostaglio and Amikam Levy and Nicole Fabbri},
doi = {10.1103/physrevresearch.6.023280},
issn = {2643-1564},
year = {2024},
date = {2024-05-21},
journal = {Phys. Rev. Research},
volume = {6},
number = {2},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>Quantum correlation functions are a natural way to encode multitime information, as they are ubiquitous in analysis from fluctuation theorems to information scrambling. Correlation functions can be identified with quasiprobabilities associated to quantum processes. In this work we show how these can be measured via error-cancellation techniques, using projective measurements only and no ancillae. The scheme is implemented in a nitrogen-vacancy center in diamond undergoing a unitary quantum work protocol. We reconstruct quantum-mechanical time correlations encoded in the Margenau-Hills quasiprobabilities by observing work extraction peaks five times those of sequential projective energy measurement schemes and in violation of newly derived stochastic bounds. We interpret the phenomenon via anomalous energy exchanges due to the underlying negativity of the quasiprobability distribution.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>Quantum correlation functions are a natural way to encode multitime information, as they are ubiquitous in analysis from fluctuation theorems to information scrambling. Correlation functions can be identified with quasiprobabilities associated to quantum processes. In this work we show how these can be measured via error-cancellation techniques, using projective measurements only and no ancillae. The scheme is implemented in a nitrogen-vacancy center in diamond undergoing a unitary quantum work protocol. We reconstruct quantum-mechanical time correlations encoded in the Margenau-Hills quasiprobabilities by observing work extraction peaks five times those of sequential projective energy measurement schemes and in violation of newly derived stochastic bounds. We interpret the phenomenon via anomalous energy exchanges due to the underlying negativity of the quasiprobability distribution.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
35.
Mendonça, Taysa M.; Céleri, Lucas C.; Paternostro, Mauro; Soares-Pinto, Diogo O.
System-environment quantum information flow Journal Article
In: Phys. Rev. A, vol. 110, no. 4, 2024, ISSN: 2469-9934.
@article{Mendonça2024,
title = {System-environment quantum information flow},
author = {Taysa M. Mendonça and Lucas C. Céleri and Mauro Paternostro and Diogo O. Soares-Pinto},
doi = {10.1103/physreva.110.l040401},
issn = {2469-9934},
year = {2024},
date = {2024-05-15},
journal = {Phys. Rev. A},
volume = {110},
number = {4},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>The return of the information from the environment to the system is a phenomenon that can be related to the existence of non-Markovian mechanisms in the environment, and such a transformation of resources can be useful for quantum information applications. Thus, understanding the details of the system-environment information dynamics, i.e., the transference of quantum resources, is of key importance to design noise-resilient quantum technologies. In this Letter, we show how a quantum resource propagates from the main system to an environment, using as a model a single qubit coupled to two linear chains of qubits, and also the information dynamics among the environment qubits. In this way, we characterize the propagation of information leaving the main qubit and going through the environment. Finally, we connect the conditions for the emergence of this dynamics to the existence of quantum Darwinism.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>The return of the information from the environment to the system is a phenomenon that can be related to the existence of non-Markovian mechanisms in the environment, and such a transformation of resources can be useful for quantum information applications. Thus, understanding the details of the system-environment information dynamics, i.e., the transference of quantum resources, is of key importance to design noise-resilient quantum technologies. In this Letter, we show how a quantum resource propagates from the main system to an environment, using as a model a single qubit coupled to two linear chains of qubits, and also the information dynamics among the environment qubits. In this way, we characterize the propagation of information leaving the main qubit and going through the environment. Finally, we connect the conditions for the emergence of this dynamics to the existence of quantum Darwinism.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
34.
Campbell, Conall J.; Hawkins, Adam G.; Zicari, Giorgio; Paternostro, Mauro; McAleese, Hannah
Entanglement distribution through separable states via a zero-added-loss photon multiplexing inspired protocol Journal Article
In: Phys. Rev. Research, vol. 6, no. 3, 2024, ISSN: 2643-1564.
@article{Campbell2024,
title = {Entanglement distribution through separable states via a zero-added-loss photon multiplexing inspired protocol},
author = {Conall J. Campbell and Adam G. Hawkins and Giorgio Zicari and Mauro Paternostro and Hannah McAleese},
doi = {10.1103/physrevresearch.6.033317},
issn = {2643-1564},
year = {2024},
date = {2024-05-09},
journal = {Phys. Rev. Research},
volume = {6},
number = {3},
publisher = {American Physical Society (APS)},
abstract = {<jats:p>The recently proposed zero-added-loss multiplexing (ZALM) source of entangled photons enables higher efficiency in entanglement distribution than spontaneous parametric down-conversion sources and can be carried out using both space-to-ground and ground-to-ground links. We demonstrate the flexibility of ZALM architectures to be adapted to alternative entanglement distribution protocols. Focusing on the counterintuitive result that entanglement can be generated between distant parties without using any entanglement as a resource, we analyze two protocols for entanglement distribution to memories via separable states. Modeling them in a ZALM setup, we consider the effects of noise both in the communication channels and in the memories. We thereby identify the optimal protocol to use with respect to the highest entanglement generated, given the noise conditions of the network.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
<jats:p>The recently proposed zero-added-loss multiplexing (ZALM) source of entangled photons enables higher efficiency in entanglement distribution than spontaneous parametric down-conversion sources and can be carried out using both space-to-ground and ground-to-ground links. We demonstrate the flexibility of ZALM architectures to be adapted to alternative entanglement distribution protocols. Focusing on the counterintuitive result that entanglement can be generated between distant parties without using any entanglement as a resource, we analyze two protocols for entanglement distribution to memories via separable states. Modeling them in a ZALM setup, we consider the effects of noise both in the communication channels and in the memories. We thereby identify the optimal protocol to use with respect to the highest entanglement generated, given the noise conditions of the network.</jats:p>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
<jats:sec>
<jats:title/>
<jats:supplementary-material>
<jats:permissions>
<jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement>
<jats:copyright-year>2024</jats:copyright-year>
</jats:permissions>
</jats:supplementary-material>
</jats:sec>
33.
Bartolomeo, Giovanni Di; Carlesso, Matteo
Experimental bounds on linear-friction dissipative collapse models from levitated optomechanics Journal Article
In: New J. Phys., vol. 26, no. 4, 2024, ISSN: 1367-2630.
@article{DiBartolomeo2024,
title = {Experimental bounds on linear-friction dissipative collapse models from levitated optomechanics},
author = {Giovanni Di Bartolomeo and Matteo Carlesso},
doi = {10.1088/1367-2630/ad3842},
issn = {1367-2630},
year = {2024},
date = {2024-04-01},
journal = {New J. Phys.},
volume = {26},
number = {4},
publisher = {IOP Publishing},
abstract = {Abstract
Collapse models constitute an alternative to quantum mechanics that solve the well-know quantum measurement problem. In this framework, a novel approach to include dissipation in collapse models has been recently proposed, and awaits experimental scrutiny. Our work establishes experimental bounds on the so-constructed linear-friction dissipative Diósi-Penrose (dDP) and Continuous Spontaneous localisation (dCSL) models by exploiting experiments in the field of levitated optomechanics. Our results in the dDP case exclude collapse temperatures below 10−13 K and
6
×
10
−
12
−6 m and 10−8 m. In the dCSL case the entire parameter space is excluded for values of the temperature lower than
6
×
10
−
9
},
keywords = {},
pubstate = {published},
tppubtype = {article}
}