Physics

Entanglement-enhanced matter-wave interferometry in a high-finesse cavity

G. P. Greve, C. Luo, et al.

Discover groundbreaking advancements in matter-wave interferometry as Graham P. Greve, Chengyi Luo, Baochen Wu, and James K. Thompson demonstrate the use of 700 entangled atoms, achieving unprecedented sensitivity below the standard quantum limit! This innovative research opens doors to potential applications in enhanced inertial sensors and beyond.

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Abstract

This paper demonstrates a matter-wave interferometer using 700 atoms entangled in their external degrees of freedom, surpassing the standard quantum limit. Entanglement is generated using cavity quantum electrodynamics, employing both quantum non-demolition measurements and cavity-mediated spin interactions. The resulting squeezed momentum states exhibit sensitivity 3.4 dB and 2.5 dB below the standard quantum limit, respectively. Injection of an entangled state into a Mach-Zehnder interferometer achieves 1.7 dB below the standard quantum limit. This approach combines particle delocalization and entanglement, with potential applications in enhanced inertial sensors, searches for new physics, gravitational wave detectors, and quantum many-body physics.

Publisher

Nature

Published On

Oct 20, 2022

Authors

Graham P. Greve, Chengyi Luo, Baochen Wu, James K. Thompson

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