论文标题
测试对许多粒子状态的高阶量子干扰
Testing higher-order quantum interference with many-particle states
论文作者
论文摘要
量子理论允许在难以区分的路径之间进行干扰，但同时限制了其顺序。例如，单粒子干扰仅限于二阶，即单粒子路径对。迄今为止，所有实验性努力以搜索与量子力学兼容的高阶干扰的所有实验性均基于此类单粒子方案。但是，量子物理学不与单粒子干扰。我们在这里实验研究了使用两光子五缝设置的多粒子高阶干扰。我们观察到非零的两粒子干扰至第四阶，对应于两个不同的两粒子路径的干扰。我们进一步表明，在强度相关方案中，第五阶干扰仅限于$ 10^{ - 3} $，在光子相关方案中限于$ 10^{ - 2} $，从而在高阶量子干扰上提供了新颖的界限。
Quantum theory permits interference between indistinguishable paths but, at the same time, restricts its order. Single-particle interference, for instance, is limited to the second order, that is, to pairs of single-particle paths. To date, all experimental efforts to search for higher-order interferences beyond those compatible with quantum mechanics have been based on such single-particle schemes. However, quantum physics is not bounded to single-particle interference. We here experimentally study many-particle higher-order interference using a two-photon-five-slit setup. We observe nonzero two-particle interference up to fourth order, corresponding to the interference of two distinct two-particle paths. We further show that fifth-order interference is restricted to $10^{-3}$ in the intensity-correlation regime and to $10^{-2}$ in the photon-correlation regime, thus providing novel bounds on higher-order quantum interference.
