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Relative Acceleration Noise Mitigation for Nanocrystal Matter-wave Interferometry: Application to Entangling Masses via Quantum Gravity

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arxiv 2007.15029 v2 pith:3T7I2HJJ submitted 2020-07-29 gr-qc hep-thquant-ph

Relative Acceleration Noise Mitigation for Nanocrystal Matter-wave Interferometry: Application to Entangling Masses via Quantum Gravity

Marko Toro\v{s} , Thomas W. van de Kamp , Ryan J. Marshman , M. S. Kim , Anupam Mazumdar , Sougato Bose This is my paper
classification gr-qc hep-thquant-ph
keywords noiserelativeaccelerationaccelerationsapparatusassociatedentanglementgravity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Matter wave interferometers with large momentum transfers, irrespective of specific implementations, will face a universal dephasing due to relative accelerations between the interferometric mass and the associated apparatus. Here we propose a solution that works even without actively tracking the relative accelerations: putting both the interfering mass and its associated apparatus in a freely falling capsule, so that the strongest inertial noise components vanish due to the equivalence principle. In this setting, we investigate two of the most important remaining noise sources: (a) the non-inertial jitter of the experimental setup and (b) the gravity-gradient noise. We show that the former can be reduced below desired values by appropriate pressures and temperatures, while the latter can be fully mitigated in a controlled environment. We finally apply the analysis to a recent proposal for testing the quantum nature of gravity [S. Bose et. al. Phys. Rev. Lett 119, 240401 (2017)] through the entanglement of two masses undergoing interferometry. We show that the relevant entanglement witnessing is feasible with achievable levels of relative acceleration noise.

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