Homodyne Estimation of Gaussian Quantum Discord

被引：57
|
作者：
Blandino, Remi [1 ]
Genoni, Marco G. [2 ]
Etesse, Jean [1 ]
Barbieri, Marco [1 ]
Paris, Matteo G. A. [3 ,4 ]
Grangier, Philippe [1 ]
Tualle-Brouri, Rosa [1 ,5 ]
机构：
[1] Univ Paris 11, CNRS, Inst Opt, Lab Charles Fabry, F-91127 Palaiseau, France
[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, QOLS, London SW7 2BW, England
[3] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[4] CNISM Udr Milano, I-20133 Milan, Italy
[5] Inst Univ France, F-75005 Paris, France
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 18期
基金：
英国工程与自然科学研究理事会;
关键词：
STATES;
D O I：
10.1103/PhysRevLett.109.180402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：5
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