论文标题
连续变化的量子传送和光电检测器的最佳测试
Optimal tests for continuous-variable quantum teleportation and photodetectors
论文作者
论文摘要
量子传送是在几种重要应用中的原始性，包括量子通信，量子计算，误差校正和量子网络。在这项工作中，我们提出了一项最佳测试，以根据理想的CV传送及其实验实现之间的能量约束的通道保真度来进行连续变量（CV）量子传送的性能。在我们的工作之前，工作考虑了CV传送性能的次优测试，而是集中在特定州的性能上，例如连贯的状态，挤压状态，猫态等的合奏。在这里，我们证明了测试CV传送的最佳状态，是双胞胎Fock States的纠缠次数的最佳状态。我们通过减少估计理想CV传送及其对二次程序的实验近似之间的能源约束通道保真度的问题来确定这一结果。作为另一个结果，我们为光电探测器及其实验近似之间的能量受限的钻石距离获得了分析解决方案。这些结果与利用CV传送和光电探测器的实验有关。
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. 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.
