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Conditional Spin-Squeezing of a Large Ensemble via the Vacuum Rabi Splitting

We use the vacuum Rabi splitting to perform quantum nondemolition (QND) measurements that prepare a conditionally spin-squeezed state of a collective atomic psuedo-spin. We infer a 3.4(6) dB improvement in quantum phase estimation relative to the standard quantum limit for a coherent spin state composed of uncorrelated atoms. The measured collective spin is composed of the two-level clock states of nearly 10^6 Rb-87 atoms confined inside a low finesse F = 710 optical cavity. This technique may improve atomic sensor precision and/or bandwidth, and may lead to more precise tests of fundamental physics.

preprint2011arXivOpen access
Zilong ChenJustin G. BohnetShannon R. SankarJiayan DaiJames K. Thompson
physics.atom-phquant-ph
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Zilong ChenJustin G. BohnetShannon R. SankarJiayan DaiJames K. Thompson

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