Abstract
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.
Highlights
Double-double-slit thought experiment provides profound insight on interference of quantum entangled particles
Thought experiment showing a two-photon interference has been demonstrated with quantum correlated photons produced by spontaneous parametric down conversion (SPDC) process[20]
Experiments presented in this paper are performed with momentum entangled photons produced by type-I degenerate noncollinear SPDC process in a BBO crystal
Summary
Double-double-slit thought experiment provides profound insight on interference of quantum entangled particles. Two-photon interference pattern appears if locations of detection of photons are correlated without revealing the which-slit path information It is shown experimentally and theoretically that two-photon quantum interference disappears when the whichslit path of a photon in the double-double-slit is detected. Interference of macromolecules is the subject of great interest in the quest to realise quantum superposition of mesoscopic and macroscopic objects[12,13] In this context, number of interesting experiments have been performed to produce a path superposition of large molecules similar to the double-slit type interference e xperiments[14,15,16]. In this paper, we present a detailed experimental realisation of the quantum double-double-slit thought experiment with momentum entangled photon pairs, where a virtual double-double-slit configuration is realised with two Fresnel biprisms. An experiment of detection of a which-slit path of a photon is presented where it is shown that the two-photon interference disappears when a which-slit path of a photon is detected
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