Realizable receivers for discriminating coherent and multicopy quantum states near the quantum limit
Realizable receivers for discriminating coherent and multicopy quantum states near the quantum limit
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可实现的接收器，用于区分接近量子极限的相干和多拷贝量子态
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Si
中科院分区：
文献类型：
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作者：
R. Nair;S. Guha;Si
我们推导出了判别任意M多模相干态的误差概率指数的量子极限，并证明了对于同一信号集，它是理想外差接收机的四倍。然后，我们提出了一个接收器，实现了量子极限使用辅助相干态字段，分束器，和单光子探测器。接收机的性能进行比较，各种成像和通信任务的标准测量。一个相关的接收器，用于区分任意多拷贝纯量子态，以实现M元的量子Brackoff指数，这样做只使用本地操作和经典通信。
We derive the quantum limit on the error probability exponent for discriminating any M multimode coherent states of light and show that it is four times that of an ideal heterodyne receiver for the same signal set. We then propose a receiver that achieves the quantum limit using auxiliary coherent-state fields, beam splitters, and single-photon detectors. The performance of the receiver is compared to standard measurements for various imaging and communication tasks. A related receiver for discriminating arbitrary multicopy pure quantum states is shown to achieve the M-ary quantum Chernoff exponent and does so using only local operations and classical communication.