Experimental Higher-Order Interference in a Nonlinear Triple Slit

Interference between two waves is a well-known concept in physics, and its generalization to more than two waves is straight-forward. The order of interference is defined as the number of paths that interfere in a manner that cannot be reduced to patterns of a lower order. In practice, second-order...

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Published in:arXiv.org 2021-12
Main Authors: Namdar, Peter, Jenke, Philipp K, Irati Alonso Calafell, Trenti, Alessandro, Radonjić, Milan, Dakić, Borivoje, Walther, Philip, Rozema, Lee A
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Language:English
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Evolution
Interference
Quantum mechanics
Slits
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Jenke, Philipp K
Irati Alonso Calafell
Trenti, Alessandro
Radonjić, Milan
Dakić, Borivoje
Walther, Philip
Rozema, Lee A
description Interference between two waves is a well-known concept in physics, and its generalization to more than two waves is straight-forward. The order of interference is defined as the number of paths that interfere in a manner that cannot be reduced to patterns of a lower order. In practice, second-order interference means that in, say, a triple-slit experiment, the interference pattern when all three slits are open can be predicted from the interference patterns between all possible pairs of slits. Quantum mechanics is often said to only exhibit second-order interference. However, this is only true under specific assumptions, typically single-particles undergoing linear evolution. Here we experimentally show that nonlinear evolution can in fact lead to higher-order interference. The higher-order interference in our experiment has a simple quantum mechanical description; namely, optical coherent states interacting in a nonlinear medium. Our work shows that nonlinear evolution could open a loophole for experiments attempting to verify Born's rule by ruling out higher-order interference.
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subjects Evolution
Interference
Quantum mechanics
Slits
title Experimental Higher-Order Interference in a Nonlinear Triple Slit
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