Homodyne Estimation of Gaussian Quantum Discord
Homodyne Estimation of Gaussian Quantum Discord
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DOI：
10.1103/physrevlett.109.180402
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发表时间：
2012-11-02
影响因子：
8.6
通讯作者：
Tualle-Brouri, Rosa
中科院分区：
文献类型：
--
作者：
Blandino, Remi;Genoni, Marco G.;Tualle-Brouri, Rosa
我们解决了双模压缩热态高斯量子不和谐的实验估计，并演示了一种基于贝叶斯分析辅助的一对零差探测器的测量方案，该方案为小不和谐值提供了近乎最优的估计。此外，虽然零差检测对于高斯不和谐不是最佳的，但根据量子 Cramer-Rao 界的规定，与最终量子极限的噪声比被限制在大约 10 dB。
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.