Entanglement-induced collective many-body interference

Tommaso Faleo; Eric Brunner; Jonathan W. Webb; Alexander Pickston; Joseph Ho; Gregor Weihs; Andreas Buchleitner; Christoph Dittel; Gabriel Dufour; Alessandro Fedrizzi; Robert Keil

doi:10.1126/sciadv.adp9030

Entanglement-induced collective many-body interference

Tommaso Faleo^*, Eric Brunner, Jonathan W. Webb, Alexander Pickston, Joseph Ho, Gregor Weihs, Andreas Buchleitner, Christoph Dittel, Gabriel Dufour, Alessandro Fedrizzi, Robert Keil^*

^*Corresponding author for this work

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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.

Original language	English
Article number	eadp9030
Journal	Science Advances
Volume	10
Issue number	35
Early online date	30 Aug 2024
DOIs	https://doi.org/10.1126/sciadv.adp9030
Publication status	Published - Aug 2024

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title = "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.",

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AU - Faleo, Tommaso

AU - Brunner, Eric

AU - Webb, Jonathan W.

AU - Pickston, Alexander

AU - Ho, Joseph

AU - Weihs, Gregor

AU - Buchleitner, Andreas

AU - Dittel, Christoph

AU - Dufour, Gabriel

AU - Fedrizzi, Alessandro

AU - Keil, Robert

PY - 2024/8

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N2 - 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.

AB - 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.

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Entanglement-induced collective many-body interference

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