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首页> 外文期刊>Journal of physics, A. Mathematical and theoretical >Understanding non-classical correlation using optical hybrid states in noisy quantum channels
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Understanding non-classical correlation using optical hybrid states in noisy quantum channels

机译：在嘈杂量子通道中了解使用光学混合状态的非古典关联

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摘要

In this article we investigate the non-classical correlation in a macroscopic physical system. As a tool, we consider an optical hybrid state that is a micro- macro entangled state. Our strategy is to study the behavior of non-classical correlation in an optical hybrid state that may go through noisy channels. We study the violation of two inequalities, which are the CHSH-inequality and the (generalized) CHSH-like-inequality, as measures of non-classical correlation. First, we find that when on/off or parity measurements are used for the side of the coherent state in an optical hybrid state, the violation of the CHSH-inequality is the same as that of the (generalized) CHSH-like-inequality. Second, we see that each measurement provides a different value of violation of (generalized) CHSH-inequality when it is an optical hybrid state that goes through noisy channels. A suprising result is that the on/off measurement can provide a violation of CHSH-inequality (or (generalized) CHSH-like-inequality) for an optical hybrid state with any amount of colored noise. This implies that colored noise cannot break the non-classical correlation in an optical hybrid state.
机译：在本文中，我们研究了宏观物理系统中的非古典相关性。作为一个工具，我们考虑一种是微米缠结状态的光学混合状态。我们的策略是研究可能通过嘈杂频道的光学混合状态下的非古典相关性的行为。我们研究违反了两种不平等，这是CHSH-不平等和（广义）CHSH的不等式，作为非古典相关的措施。首先，我们发现，当在光学混合状态下打开/关或奇偶校验或奇偶校验测量时，违反CHSH-Inequality的违规与（广义）Chsh的不等式相同。其次，我们看到每种测量都提供了不同的违反（广义）CHSH-Inequality的不同价值，当通过嘈杂的频道进行光学混合状态时。出现故障的结果是开/关测量可以为光学混合状态提供违反CHSH-Inequality（或（广义）Chsh-Infequality），其具有任何彩色噪声。这意味着彩色噪声不能在光学混合状态下破坏非古典相关性。

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