论文标题
通过Hong-Ou-Mandel干扰的Qudits量子层析成像
Quantum state tomography of qudits via Hong-Ou-Mandel interference
论文作者
论文摘要
我们提出了一种使用hong-ou-mandel（hom）探针状态之间的hong-ou-mandel（hOM）干扰的$ \ mathit {n} $的量子状态断层扫描（QST）。此方法仅需要用于HOM干扰的被动梁拆分器，并删除目标模式中的所有主动光学设备，以控制常规QST中所需的测量库。因此，它适用于目标状态的各种自由度，而无需更改测量设置。此外，即使使用激光和热光等经典探针光也实现忠实的估计。作为原则证明，我们使用极化量子量表进行了实验演示。无论探针光的光子统计数据如何，状态重建的估计结果与常规QST验证的结果一样准确。
We propose a method to perform the quantum state tomography (QST) of an $\mathit{n}$-partite qudit state embedded in single photons using the Hong-Ou-Mandel (HOM) interference between the target state and probe state. This method requires only passive beam splitters for the HOM interference and removes all active optical devices in the target modes to control the measurement bases needed in conventional QST. Hence, it is applicable to various degree of freedom of the target state without altering the measurement setup. Moreover, a faithful estimation is realized even with classical probe light such as laser and thermal light. As a proof-of-principle, we performed the experimental demonstration using a polarization qubit. Regardless of the photon statistics of the probe light, the estimated results of state reconstruction are as accurate as those verified by conventional QST.
