Entanglement-assisted atomic clock beyond the projection noise limit

Details Entanglement-assisted atomic clock beyond the projection noise limit Entanglement-assisted atomic clock beyond the projection noise limit

2009-12-19

arxiv.org/abs/0912.3895v2

New J. Phys. 12 065032, 2010

Physics

Quantum Physics

Scientific paper

10.1088/1367-2630/12/6/065032

We use a quantum non-demolition measurement to generate a spin squeezed state and to create entanglement in a cloud of 10^5 cold cesium atoms, and for the first time operate an atomic clock improved by spin squeezing beyond the projection noise limit in a proof-of-principle experiment. For a clock-interrogation time of 10 \mu\s the experiments show an improvement of 1.1 dB in the signal-to-noise ratio, compared to the atomic projection noise limit.

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