标题： 用局部外差测量见证单光子纠缠：分析界限和对损耗的鲁棒性 显示英文标题

标题： Witnessing single-photon entanglement with local homodyne measurements: analytical bounds and robustness to losses

摘要： 单光子纠缠是量子网络的主要资源之一，包括量子中继架构。 这种纠缠可以通过在[莫林等，物理评论快报，110, 130401 (2013)]中提出的纠缠鉴别器，仅通过局部同相测量来揭示。 在此，我们通过引入分析边界并报告确认其对损失具有极大鲁棒性的测量结果，对该鉴别器进行了扩展分析。 这项研究突显了光学混合方法的潜力，其中离散纠缠通过连续变量测量进行表征。 显示英文摘要

摘要： Single-photon entanglement is one of the primary resources for quantum networks, including quantum repeater architectures. Such entanglement can be revealed with only local homodyne measurements through the entanglement witness presented in [Morin et al. Phys. Rev. Lett. 110, 130401 (2013)]. Here, we provide an extended analysis of this witness by introducing analytical bounds and by reporting measurements confirming its great robustness with regard to losses. This study highlights the potential of optical hybrid methods, where discrete entanglement is characterized through continuous-variable measurements.