论文标题
通过单光子干扰表征混合状态纠缠
Characterizing mixed state entanglement through single-photon interference
论文作者
论文摘要
纠缠验证和测量对于量子力学以及量子通信和信息科学的实验测试至关重要。验证双分解状态下纠缠的标准方法需要检测两个颗粒并涉及巧合测量。我们提出了一种方法，使我们能够在两光子混合状态下验证和测量纠缠，而无需检测到一个光子之一，即不进行任何巧合测量或选择后。我们考虑两个相同的来源，每个来源都可以生成相同的两光子混合状态，但它们从不同时发出。我们表明，可以产生一组单光子干扰模式，其中包含有关两光子混合状态中纠缠的信息。我们证明可以从干扰模式的可见性中检索有关纠缠的信息。我们的方法揭示了一个独特的途径，用于验证和测量混合国家的纠缠。
Entanglement verification and measurement is essential for experimental tests of quantum mechanics and also for quantum communication and information science. Standard methods of verifying entanglement in a bipartite mixed state require detection of both particles and involve coincidence measurement. We present a method that enables us to verify and measure entanglement in a two-photon mixed state without detecting one of the photons, i.e., without performing any coincidence measurement or postselection. We consider two identical sources, each of which can generate the same two-photon mixed state but they never emit simultaneously. We show that one can produce a set of single-photon interference patterns, which contain information about entanglement in the two-photon mixed state. We prove that it is possible to retrieve the information about entanglement from the visibility of the interference patterns. Our method reveals a distinct avenue for verifying and measuring entanglement in mixed states.
