Non-classical correlation of two-mode squeezed light in asymmetric optical-loss conditions
Non-classical correlation of two-mode squeezed light in asymmetric optical-loss conditions
复制标题
非对称光损耗条件下双模压缩光的非经典相关性
DOI：
10.1117/12.2321044
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Genta Masada
中科院分区：
文献类型：
--
作者：
Giichiro Uchida;Yusuke Mino;Tensho Suzuki;Kosuke Takenaka;Yuichi Setsuhara;政田元太;Genta Masada;Genta Masada
量子照明是一种利用量子纠缠来提高目标存在或不存在的错误识别概率的有吸引力的目标检测方案，即使在有损耗和噪声的环境中。在双模压缩真空态的量子照明中，其中一束纠缠光，即信号光被传输到有耗光学介质中。另一束光，即参考光，通过无损耗信道直接发送到接收机。因此，非对称光损耗对纠缠光束的影响很大。本文计算了非对称光损耗条件下双模压缩光场正交相位振幅的相关方差，并基于Duan和Simon的不可分性准则讨论了其非经典相关性。非对称光损耗敏感地增加了相关方差，违反了不可分离性准则。在这项工作中，我们考虑非对称双模压缩光作为一个初始状态，其中信号光束具有较大的正交相位振幅比参考光束。在暴露于非对称光损耗之后，仅信号光束的正交相位幅度被衰减并且变得与参考光束的正交相位幅度相当。结果表明，非对称双模压缩光场具有补偿非对称光损耗的能力，并能保持Duan和Simon意义下的不可分性判据。
Quantum illumination is an attractive scheme for target detection utilizing quantum entanglement to improve error probability of discrimination for target presence or absence even in a lossy and noisy environment. In the quantum illumination with two-mode squeezed vacuum states, one of the entangled beams, a signal beam is transmitted towards a lossy optical medium. And the other beam, a reference beam is directly sent to receiver with a lossless channel. So, the entangled light beams are affected by the asymmetric optical loss. In this work we calculate the correlation variance of quadrature phase amplitudes of two-mode squeezed light under the asymmetric optical-loss conditions and discuss its non-classical correlation based on Duan’s and Simon’s inseparability criterion. The asymmetric optical loss sensitively increases the correlation variance and violates the inseparability criterion. In this work we consider asymmetric two-mode squeezed light as an initial state where the signal beam has larger quadrature phase amplitudes than the reference beam. After exposition to the asymmetric optical loss only the quadrature phase amplitudes of the signal beam is attenuated and become comparable to those of the reference beam. As a result it is expected that the asymmetric two-mode squeezed light has an ability to compensate the effect of the asymmetric optical loss and can maintain the inseparability criterion in the sense of Duan and Simon.