Optimal tests for continuous-variable quantum teleportation and photodetectors
Optimal tests for continuous-variable quantum teleportation and photodetectors
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DOI：
10.1103/physrevresearch.4.023066
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发表时间：
2020-12
期刊：
影响因子：
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通讯作者：
Kunal Sharma-;B. Sanders;M. Wilde
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文献类型：
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作者：
Kunal Sharma-;B. Sanders;M. Wilde
量子隐形传态是量子通信、量子计算、纠错和量子网络等重要应用的基础。在这项工作中，我们提出了一个最佳的测试连续变量（CV）量子隐形传态的性能在能量约束的信道保真度之间的理想CV隐形传态和它的实验实现。所有的工作之前，我们认为次优测试CV隐形传态的性能，而不是专注于其性能的特定状态，如合奏的相干态，压缩态，猫态等，在这里，我们证明了测试CV隐形传态的最佳状态是一个纠缠叠加的twin-Fock态。通过将理想CV隐形传态与其实验近似之间的能量约束信道保真度的估计问题简化为二次规划并求解，得到了该结果，并得到了光电探测器与其实验近似之间的能量约束金刚石距离的解析解。这些结果是相关的实验，利用CV隐形传态和光电探测器。
Quantum teleportation is a primitive in several important applications, including quantum communication, quantum computation, error correction, and quantum networks. In this work, we propose an optimal test for the performance of continuous-variable (CV) quantum teleportation in terms of the energy-constrained channel fidelity between ideal CV teleportation and its experimental implementation. All work prior to ours considered suboptimal tests of the performance of CV teleportation, focusing instead on its performance for particular states, such as ensembles of coherent states, squeezed states, cat states, etc. Here we prove that the optimal state for testing CV teleportation is an entangled superposition of twin-Fock states. We establish this result by reducing the problem of estimating the energy-constrained channel fidelity between ideal CV teleportation and its experimental approximation to a quadratic program and solving it. As an additional result, we obtain an analytical solution to the energy-constrained diamond distance between a photodetector and its experimental approximation. These results are relevant for experiments that make use of CV teleportation and photodetectors.