Entanglement-induced collective many-body interference
Abstract
Entanglement and interference are both hallmark effects of quantum physics. Particularly rich dynamics arise when multiple (at least partially) indistinguishable particles are subjected to either of these phenomena. By combining both entanglement and many-particle interference, we propose an interferometric setting through which N-particle interference can be observed, while any interference of lower orders is strictly suppressed. We experimentally demonstrate this effect in a four-photon interferometer, where the interference is nonlocal, in principle, as only pairs of photons interfere at two separate and independent beam splitters. A joint detection of all four photons identifies a high-visibility interference pattern varying as a function of their collective four-particle phase, a genuine four-body property.
Cite
@article{arxiv.2310.08630,
title = {Entanglement-induced collective many-body interference},
author = {Tommaso Faleo and Eric Brunner and Jonathan W. Webb and Alexander Pickston and Joseph Ho and Gregor Weihs and Andreas Buchleitner and Christoph Dittel and Gabriel Dufour and Alessandro Fedrizzi and Robert Keil},
journal= {arXiv preprint arXiv:2310.08630},
year = {2024}
}