During the QuCoM project (2024/25 and 2025/26), the experimental teams at the University of Southampton and Leiden University held regular monthly coordination meetings, taking place on the first Wednesday of each month at 10:00 am UK time. These meetings provided an important platform for continuous exchange on the progress of gravity sensing experiments at both institutions. Discussions covered the development and operation of cryogenic systems, implementation of Meissner traps, and techniques for detecting the motion of levitated particles. A major focus was the challenge of particle loading while avoiding trapped magnetic flux in the type-I superconducting traps, for which several loading concepts and mitigation strategies were explored collaboratively. The teams also coordinated different experimental approaches for the planned two-mass gravity experiments, including source-mass modulation inside cryogenic environments, low-temperature actuation methods, conditioning of the probe mass, optimisation of mechanical modes, and suitable interaction distances. Although both groups pursued complementary experimental strategies, the work remained closely coordinated through continuous discussion of technical improvements, encountered issues, and possible solutions. The meetings further included exchanges on vibration-isolation strategies, sharing of preliminary data and experimental results, and joint brainstorming sessions to address challenges in the setups. This close collaboration significantly accelerated experimental progress and strengthened the coherence of the overall QuCoM gravity-sensing effort.
