论文标题
用环状整合干涉仪量化N-光子的不可区分性
Quantifying n-photon indistinguishability with a cyclic integrated interferometer
论文作者
论文摘要
我们报告了一种通用方法，以测量N光子的真正不可区分性，这是一种决定光量子计算准确性的关键参数。我们的方法依赖于具有n = 2N模式的低深度循环多托干涉仪，导致量子干扰条纹的可见性直接测量了真正的N-Photon无法区分。我们在实验上证明了使用飞秒激光微加工制造的8模式集成干涉仪和来自量子点单光子源的四个光子的技术。我们测量的四光量不可区分性高达0.81 $ \ pm $ 0.03。随着我们故意改变光子成对不可区分性，该值会降低。低深度和低损耗的多级干涉仪设计提供了一个有效且可扩展的途径，以评估升高光子数量的资源状态的真正不可区分性。
We report on a universal method to measure the genuine indistinguishability of n-photons - a crucial parameter that determines the accuracy of optical quantum computing. Our approach relies on a low-depth cyclic multiport interferometer with N = 2n modes, leading to a quantum interference fringe whose visibility is a direct measurement of the genuine n-photon indistinguishability. We experimentally demonstrate this technique for a 8-mode integrated interferometer fabricated using femtosecond laser micromachining and four photons from a quantum dot single-photon source. We measure a four-photon indistinguishability up to 0.81$\pm$0.03. This value decreases as we intentionally alter the photon pairwise indistinguishability. The low-depth and low-loss multiport interferometer design provides an efficient and scalable path to evaluate the genuine indistinguishability of resource states of increasing photon number.
