Protocol for Precise Field Sensing in the Optical Domain with Cold Atoms in a Cavity

Author
Abstract
In the context of quantum metrology, optical cavity-QED platforms have primarily been focused on the generation of entangled atomic spin states useful for next-generation frequency and time standards. Here, we report a complementary application: The use of optical cavities to generate non-classical states of light for electric field sensing below the standard quantum limit. We show that cooperative atom-light interactions in the strong collective coupling regime can be used to engineer generalized atom-light cat states which enable quantum enhanced sensing of small displacements of the cavity field even in the presence of photon loss. We demonstrate that metrological gains of 10-20 dB below the standard quantum limit are within reach for current cavity-QED systems operating with long-lived alkaline-earth atoms.
Year of Publication
2020
Journal
Physical Review Letters
Volume
124
Number of Pages
193602
Date Published
2020-05
URL
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.193602
DOI
10.1103/PhysRevLett.124.193602
JILA PI
Associated Institutes
Journal Article