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=2n 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 fourphoton 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.

Quantifying n-Photon Indistinguishability with a Cyclic Integrated Interferometer / Pont, Mathias; Albiero, Riccardo; Thomas, Sarah E.; Spagnolo, Nicolo'; Ceccarelli, Francesco; Corrielli, Giacomo; Brieussel, Alexandre; Somaschi, Niccolo; Huet, Helio; Harouri, Abdelmounaim; Lemaitre, Aristide; Sagnes, Isabelle; Belabas, Nadia; Sciarrino, Fabio; Osellame, Roberto; Senellart, Pascale; Crespi, Andrea. - In: PHYSICAL REVIEW. X. - ISSN 2160-3308. - 12:3(2022). [10.1103/physrevx.12.031033]

Quantifying n-Photon Indistinguishability with a Cyclic Integrated Interferometer

Nicolo Spagnolo;Fabio Sciarrino;
2022

Abstract

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=2n 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 fourphoton 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.
2022
quantum optics; quantum interference; multiphoton indistinguishability
01 Pubblicazione su rivista::01a Articolo in rivista
Quantifying n-Photon Indistinguishability with a Cyclic Integrated Interferometer / Pont, Mathias; Albiero, Riccardo; Thomas, Sarah E.; Spagnolo, Nicolo'; Ceccarelli, Francesco; Corrielli, Giacomo; Brieussel, Alexandre; Somaschi, Niccolo; Huet, Helio; Harouri, Abdelmounaim; Lemaitre, Aristide; Sagnes, Isabelle; Belabas, Nadia; Sciarrino, Fabio; Osellame, Roberto; Senellart, Pascale; Crespi, Andrea. - In: PHYSICAL REVIEW. X. - ISSN 2160-3308. - 12:3(2022). [10.1103/physrevx.12.031033]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1663566
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