论文标题
Hong-Ou-Mandel干涉仪和一般两光子测量的量子计量时间限制
Quantum metrology timing limits of the Hong-Ou-Mandel interferometer and of general two-photon measurements
论文作者
论文摘要
我们检查了洪 - 摩曼德（HOM）时序测量值的精确限制，以及适用于广义两光子测量值的精确限制。作为一种特殊情况，我们考虑使用具有可变带宽和频率相关性的光子使用两光子测量值。当光子带宽不相等时，最大化测量精度涉及高干扰可见性和强频率反相关之间的权衡，当光子共享非最大最大频率的反相关时，最佳精度就会发生。我们表明，每当广义测量对两个光子的净延迟不敏感时，广义测量的精度限制在质量上与HOM测量的限制相似。通过检查具有更一般频率分布的状态的性能，我们的分析允许在现实情况下使用关节光谱振幅的工程，在这种情况下，两种光子都可能没有理想的光谱特性。
We examine the precision limits of Hong-Ou-Mandel (HOM) timing measurements, as well as precision limits applying to generalized two-photon measurements. As a special case, we consider the use of two-photon measurements using photons with variable bandwidths and frequency correlations. When the photon bandwidths are not equal, maximizing the measurement precision involves a trade-off between high interference visibility and strong frequency anticorrelations, with the optimal precision occuring when the photons share non-maximal frequency anticorrelations. We show that a generalized measurement has precision limits that are qualitatively similar to those of the HOM measurement whenever the generalized measurement is insensitive to the net delay of both photons. By examining the performance of states with more general frequency distributions, our analysis allows for engineering of the joint spectral amplitude for use in realistic situations, in which both photons may not have ideal spectral properties.
