论文标题
自适应广义测量，用于对第四阶段相干状态的明确状态歧视
Adaptive generalized measurement for unambiguous state discrimination of quaternary phase-shift-keying coherent states
论文作者
论文摘要
鉴定非歧义的非正交状态的广义量子测量通常在各种量子应用中起着必不可少的作用。对于这种明确的状态歧视方案，我们有有限的概率获得不确定的结果并最大程度地减少了不确定结果的概率特别重要。在本文中，我们在实验上展示了一种自适应的广义测量值，可以明确地区分第四纪相位键钥匙的连贯状态，其性能几乎是最佳性能。我们的方案由位移操作，单个光子检测和对位移的自适应控制组成，取决于光子检测结果史。我们的实验结果表明，与常规静态广义测量值相对于不可避免的实验缺陷引起的决定性结果的可能性明显改善。
Generalized quantum measurements identifying non-orthogonal states without ambiguity often play an indispensable role in various quantum applications. For such unambiguous state discrimination scenario, we have a finite probability of obtaining inconclusive results and minimizing the probability of inconclusive results is of particular importance. In this paper, we experimentally demonstrate an adaptive generalized measurement that can unambiguously discriminate the quaternary phase-shift-keying coherent states with a near-optimal performance. Our scheme is composed of displacement operations, single photon detections and adaptive control of the displacements dependent on a history of photon detection outcomes. Our experimental results show a clear improvement of both a probability of conclusive results and a ratio of erroneous decision caused by unavoidable experimental imperfections over conventional static generalized measurements.
