Homodyne estimation of Gaussian quantum discord

We address the experimental estimation of Gaussian quantum discord for a two-mode squeezed thermal state, and demonstrate a measurement scheme based on a pair of homodyne detectors assisted by Bayesian analysis, which provides nearly optimal estimation for small value of discord. In addition, though...

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Bibliographic Details
Published in:Physical review letters 2012-11, Vol.109 (18), p.180402-180402, Article 180402
Main Authors: Blandino, Rémi, Genoni, Marco G, Etesse, Jean, Barbieri, Marco, Paris, Matteo G A, Grangier, Philippe, Tualle-Brouri, Rosa
Format: Article
Language:English
Subjects:
Physics
Quantum Physics
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Summary:We address the experimental estimation of Gaussian quantum discord for a two-mode squeezed thermal state, and demonstrate a measurement scheme based on a pair of homodyne detectors assisted by Bayesian analysis, which provides nearly optimal estimation for small value of discord. In addition, though homodyne detection is not optimal for Gaussian discord, the noise ratio to the ultimate quantum limit, as dictated by the quantum Cramer-Rao bound, is limited to about 10 dB.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.109.180402