Spin-squeezing of a large-spin system via QND measurement

Details Spin-squeezing of a large-spin system via QND measurement Spin-squeezing of a large-spin system via QND measurement

2011-11-29

arxiv.org/abs/1111.6969v2

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

We demonstrate spin squeezing and entanglement in a large-spin system via quantum non-demolition measurement. We make non-destructive, projection-noise-limited collective spin measurements on an ensemble of up to in $8.4\times10^5$ laser-cooled \rb atoms in the $f=1$ hyperfine ground state. A dynamically-decoupled probing scheme [Phys. Rev. Lett. {\bf 105}, 093602 (2010)] prevents probe-induced decoherence, and techniques for compensation of magnetic field gradients [APL {\bf 98}, 074101, (2011)] extend the lifetime of the coherent spin state to $290\,\mu s$. Repeated measurements show correlations beyond the standard quantum limit, indicating generation of a spin-squeezed state with up to -3.2\,dB of noise reduction and -1.8\,dB of metrologically-relevant squeezing.

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