Double-double-slit thought experiment provides profound insight on interference of quantum entangled particles. This paper presents a detailed experimental realisation of quantum double-double-slit thought experiment with momentum entangled photons and theoretical analysis of the experiment. Experiment is configured in such a way that photons are path entangled and each photon can reveal the which-slit path information of the other photon. As a consequence, single photon interference is suppressed. However, two-photon interference pattern appears if locations of detection of photons are correlated without revealing the which-slit path information. It is also shown experimentally and theoretically that two-photon quantum interference disappears when the which-slit path of a photon in the double-double-slit is detected.

双双缝思想实验提供了对量子纠缠粒子干涉的深刻见解。本文详细介绍了动量纠缠光子量子双双缝思想实验的实验实现和实验的理论分析。实验是这样配置的：光子被路径纠缠，每个光子可以显示另一个光子的哪条路径信息。结果，抑制了单光子干扰。但是，如果在不透露哪条狭缝路径信息的情况下关联了光子的检测位置，则会出现两光子干涉图案。从实验和理论上也表明，当检测到双双缝中光子的哪条缝路径时，双光子量子干扰就消失了。