Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector
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DOI：
10.1103/physreva.81.062338
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发表时间：
2010-02
影响因子：
2.9
通讯作者：
C. Wittmann;U. Andersen;M. Takeoka;G. Leuchs
中科院分区：
文献类型：
--
作者：
C. Wittmann;U. Andersen;M. Takeoka;G. Leuchs
我们研究了一种量子测量策略，该策略能够概率地区分两个相干状态，其误差概率明显小于使用非概率状态识别所能获得的误差概率。为了降低误差概率，我们对纯差探测器和光子数分辨探测器的测量数据采用了后选择策略。我们比较了两种不同的接收器与一个最优的中间测量方案，其中错误率是最小的固定率的不确定的结果。实验证明了光子数分辨（PNR）接收器，并与后选择纯差接收器的实验实现进行了比较。在比较中，PNR接收机的性能明显优于纯差接收机的性能，我们证明在任何高斯操作和条件动态下都是最优的。
We investigate quantum measurement strategies capable of discriminating two coherent states probabilistically with significantly smaller error probabilities than can be obtained using nonprobabilistic state discrimination. We apply a postselection strategy to the measurement data of a homodyne detector as well as a photon number resolving detector in order to lower the error probability. We compare the two different receivers with an optimal intermediate measurement scheme where the error rate is minimized for a fixed rate of inconclusive results. The photon number resolving (PNR) receiver is experimentally demonstrated and compared to an experimental realization of a homodyne receiver with postselection. In the comparison, it becomes clear that the performance of the PNR receiver surpasses the performance of the homodyne receiver, which we prove to be optimal within any Gaussian operations and conditional dynamics.