连续变量准备测量系统中的有效纠缠及其在后选择QKD方案中的应用
Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection
摘要：
本文报道了一种制备&测量型量子密钥分发协议中有效纠缠的实验证明。利用相干偏振态和外差测量来表征透射量子态，从而使我们能够直接重建它们的Q函数。通过评估状态的多余噪声，我们实验证明它们满足Rigas等人先前提出的不可分离性标准[J. Rigas，O.居恩河Lütkenhaus，Phys.Rev.A73，012341（2006）]。对于一个受限制的窃听情况下，我们预测的外差测量结果的后选择的关键利率。
英文摘要：
We report an experimental demonstration of effective entanglement in a prepare&measure type of quantum key distribution protocol. Coherent polarization states and heterodyne measurement to characterize the transmitted quantum states are used, thus enabling us to reconstruct directly their Q-function. By evaluating the excess noise of the states, we experimentally demonstrate that they fulfill a non-separability criterion previously presented by Rigas et al. [J. Rigas, O. Gühne, N. Lütkenhaus, Phys. Rev. A 73, 012341 (2006)]. For a restricted eavesdropping scenario we predict key rates using postselection of the heterodyne measurement results.
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