Photon indistinguishability plays a fundamental role in information processing, with applications such as linear-optical quantum computation and metrology. It is then necessary to develop appropriate tools to quantify the amount of this resource in a multiparticle scenario. Here we report a four-photon experiment in a linear-optical interferometer designed to simultaneously estimate the degree of indistinguishability between three pairs of photons. The interferometer design dispenses with the need of heralding for parametric down-conversion sources, resulting in an efficient and reliable optical scheme. We then use a recently proposed theoretical framework to quantify genuine four-photon indistinguishability, as well as to obtain bounds on three unmeasured two-photon overlaps. Our findings are in high agreement with the theory, and represent a new resource-effective technique for the characterization of multiphoton interference.

Experimental quantification of four-photon indistinguishability / Giordani, Taira; Brod, Daniel J.; Esposito, Chiara; Viggianiello, Niko; Romano, Marco; Flamini, Fulvio; Gonzalo, Carvacho; Spagnolo, Nicolo'; Galvão, Ernesto F.; Sciarrino, Fabio. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 22:4(2020). [10.1088/1367-2630/ab7a30]

Experimental quantification of four-photon indistinguishability

Taira Giordani;Chiara Esposito;Gonzalo Carvacho;Nicolò Spagnolo
;
Fabio Sciarrino
2020

Abstract

Photon indistinguishability plays a fundamental role in information processing, with applications such as linear-optical quantum computation and metrology. It is then necessary to develop appropriate tools to quantify the amount of this resource in a multiparticle scenario. Here we report a four-photon experiment in a linear-optical interferometer designed to simultaneously estimate the degree of indistinguishability between three pairs of photons. The interferometer design dispenses with the need of heralding for parametric down-conversion sources, resulting in an efficient and reliable optical scheme. We then use a recently proposed theoretical framework to quantify genuine four-photon indistinguishability, as well as to obtain bounds on three unmeasured two-photon overlaps. Our findings are in high agreement with the theory, and represent a new resource-effective technique for the characterization of multiphoton interference.
2020
quantum information; indistinguishability test; multiphoton interference
01 Pubblicazione su rivista::01a Articolo in rivista
Experimental quantification of four-photon indistinguishability / Giordani, Taira; Brod, Daniel J.; Esposito, Chiara; Viggianiello, Niko; Romano, Marco; Flamini, Fulvio; Gonzalo, Carvacho; Spagnolo, Nicolo'; Galvão, Ernesto F.; Sciarrino, Fabio. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 22:4(2020). [10.1088/1367-2630/ab7a30]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1339862
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