Bosonic interference is a fundamental physical phenomenon, and it is believed to lie at the heart of quantum computational advantage. It is thus necessary to develop practical tools to witness its presence, both for a reliable assessment of a quantum source and for fundamental investigations. Here we describe how linear interferometers can be used to unambiguously witness genuine n-boson indistinguishability. The amount of violation of the proposed witnesses bounds the degree of multiboson indistinguishability, for which we also provide a novel intuitive model using set theory. We experimentally implement this test to bound the degree of three-photon indistinguishability in states we prepare using parametric down-conversion. Our approach results in a convenient tool for practical photonic applications, and may inspire further fundamental advances based on the operational framework we adopt.

Witnessing genuine multiphoton indistinguishability / Brod, Daniel J.; Galvão, Ernesto F.; Viggianiello, Niko; Flamini, Fulvio; Spagnolo, Nicolò; Sciarrino, Fabio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 122:6(2019). [10.1103/PhysRevLett.122.063602]

Witnessing genuine multiphoton indistinguishability

Spagnolo, Nicolò;Sciarrino, Fabio
2019

Abstract

Bosonic interference is a fundamental physical phenomenon, and it is believed to lie at the heart of quantum computational advantage. It is thus necessary to develop practical tools to witness its presence, both for a reliable assessment of a quantum source and for fundamental investigations. Here we describe how linear interferometers can be used to unambiguously witness genuine n-boson indistinguishability. The amount of violation of the proposed witnesses bounds the degree of multiboson indistinguishability, for which we also provide a novel intuitive model using set theory. We experimentally implement this test to bound the degree of three-photon indistinguishability in states we prepare using parametric down-conversion. Our approach results in a convenient tool for practical photonic applications, and may inspire further fundamental advances based on the operational framework we adopt.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11573/1253939
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