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Article Dans Une Revue Physical Review X Année : 2022

Quantifying n -Photon Indistinguishability with a Cyclic Integrated Interferometer

Riccardo Albiero
Giacomo Corrielli
Niccolo Somaschi
  • Fonction : Auteur
Nadia Belabas
Fabio Sciarrino
  • Fonction : Auteur
Roberto Osellame
Andrea Crespi

Résumé

We report on a universal method to measure the genuine indistinguishability of n photons—a crucial parameter that determines the accuracy of optical quantum computing. Our approach relies on a low-depth cyclic multiport interferometer with N = 2 n modes, leading to a quantum interference fringe whose visibility is a direct measurement of the genuine n -photon indistinguishability. We experimentally demonstrate this technique for an eight-mode integrated interferometer fabricated using femtosecond laser micromachining and four photons from a quantum dot single-photon source. We measure a four-photon indistinguishability up to 0.81 ± 0.03 . This value decreases as we intentionally alter the photon pairwise indistinguishability. The low-depth and low-loss multiport interferometer design provides an original path to evaluate the genuine indistinguishability of resource states of increasing photon number.

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Dates et versions

hal-03876823 , version 1 (28-11-2022)

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Citer

Mathias Pont, Riccardo Albiero, Sarah Thomas, Nicolò Spagnolo, Francesco Ceccarelli, et al.. Quantifying n -Photon Indistinguishability with a Cyclic Integrated Interferometer. Physical Review X, 2022, 12 (3), pp.031033. ⟨10.1103/PhysRevX.12.031033⟩. ⟨hal-03876823⟩
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