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

2020; American Physical Society; Volume: 124; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.124.193602

1092-0145

Robert J. Lewis-Swan, Diego Barberena, Juan A. Muniz, Julia R. K. Cline, Dylan J. Young, James K. Thompson, Ana María Rey,

Cold Atom Physics and Bose-Einstein Condensates

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 nonclassical 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.