The second-order coherence of light is a widely recognized physical quantity used to assess the quantum characteristics of light, and its properties have been extensively investigated in the field of quantum optics. Recently, it has been proposed that second-order coherence can be utilized as an indicator of quantum entanglement. In this study, we evaluated the second-order coherence in the context of the moving-mirror model, which serves as an analog model for Hawking radiation from a black hole. We discuss the relation between entanglement and the second-order coherence of Hawking radiation paying attention to the “noise” effect due to the thermality of Hawking radiation, which reduces the quantum correlation in the entanglement-harvesting protocol with two-qubit detectors.

中文翻译：

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二阶相干性作为移动镜模型中霍金辐射量子纠缠的指标


光的二阶相干性是一个被广泛认可的物理量，用于评估光的量子特性，其特性已在量子光学领域得到广泛研究。最近，有人提出二阶相干可以用作量子纠缠的指标。在这项研究中，我们在移动镜模型的背景下评估了二阶相干性，该模型用作黑洞霍金辐射的模拟模型。我们讨论了纠缠与霍金辐射的二阶相干性之间的关系，并注意由于霍金辐射的热性而产生的“噪声”效应，这降低了使用双量子比特探测器的纠缠-收集协议中的量子相关性。