Kaur Manpreet, Singh Mandip
Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector-81, Mohali, 140306, India.
Sci Rep. 2020 Jul 10;10(1):11427. doi: 10.1038/s41598-020-68181-1.
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.
双双缝思想实验为量子纠缠粒子的干涉提供了深刻见解。本文介绍了利用动量纠缠光子对量子双双缝思想实验的详细实验实现以及该实验的理论分析。实验的配置方式使得光子在路径上纠缠，并且每个光子都能揭示另一个光子的双缝路径信息。结果，单光子干涉被抑制。然而，如果光子的探测位置相关且不揭示双缝路径信息，就会出现双光子干涉图样。实验和理论还表明，当双双缝中一个光子的双缝路径被探测到时，双光子量子干涉就会消失。
