Rémi Blandino, Marco G. Genoni, Etesse Jean, Marco Barbieri, Matteo G. A. Paris, Philippe Grangier, Rosa Tualle-Brouri
We address the experimental estimation of Gaussian quantum discord for two-mode squeezed state, and demonstrate a measurement scheme based on a pair of homodyne detectors assisted by Bayesian analysis. Our scheme provides nearly optimal estimation for small value of discord, where Bayesian analysis allows to greatly improves performances. Besides, though homodyne detection is not optimal for Gaussian discord, the noise ratio to the ultimate quantum limit is limited to about 10 dB. Our results illustrate how suitable data processing can decrease significantly the uncertainty when optimal detection schemes are not available.
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http://arxiv.org/abs/1203.1127
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