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Homodyne estimation of Gaussian quantum discord

Abstract : We address the experimental estimation of Gaussian quantum discord for 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. Besides, though homodyne detection is not optimal for Gaussian discord, the noise ratio to the ultimate quantum limit, as dictacted by the quantum Cramer-Rao bound, is limited to about 10 dB.
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Contributor : Rémi Blandino <>
Submitted on : Monday, June 11, 2012 - 8:11:18 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:40 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 2:45:25 AM

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Rémi Blandino, Marco Genoni, Jean Etesse, Marco Barbieri, Matteo G. A. Paris, et al.. Homodyne estimation of Gaussian quantum discord. Physical Review Letters, American Physical Society, 2012, 109 (18), pp.180402. ⟨10.1103/PhysRevLett.109.180402⟩. ⟨hal-00676458v3⟩

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