Efficient quantification of non-Gaussian spin distributions

Details Efficient quantification of non-Gaussian spin distributions Efficient quantification of non-Gaussian spin distributions

2011-12-16

arxiv.org/abs/1112.3814v1

Physics

Quantum Physics

Scientific paper

We study theoretically and experimentally the quantification of non-Gaussian distributions via non-destructive measurements. Using the theory of cumulants, their unbiased estimators, and the uncertainties of these estimators, we describe a quantification which is simultaneously efficient, unbiased by measurement noise, and suitable for hypothesis tests, e.g., to detect non-classical states. The theory is applied to cold $^{87}$Rb spin ensembles prepared in non-gaussian states by optical pumping and measured by non-destructive Faraday rotation probing. We find an optimal use of measurement resources under realistic conditions, e.g., in atomic ensemble quantum memories.

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