Quantifying n-photon indistinguishability with a cyclic integrated interferometer

• URL: http://arxiv.org/abs/2201.13333v1
• Date: Mon, 31 Jan 2022 16:30:52 GMT
• Title: Quantifying n-photon indistinguishability with a cyclic integrated interferometer
• Authors: Mathias Pont, Riccardo Albiero, Sarah E. Thomas, Nicol\`o Spagnolo, Francesco Ceccarelli, Giacomo Corrielli, Alexandre Brieussel, Niccolo Somaschi, H\^elio Huet, Abdelmounaim Harouri, Aristide Lema\^itre, Isabelle Sagnes, Nadia Belabas, Fabio Sciarrino, Roberto Osellame, Pascale Senellart, Andrea Crespi
• Abstract summary: We report on a universal method to measure the genuine indistinguishability of n-photons. Our approach relies on a low-depth cyclic multiport interferometer with N = 2n modes. We experimentally demonstrate this technique for a 8-mode integrated interferometer fabricated using femtosecond laser micromachining.
• Score: 40.24757332810004
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 a 8-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$\pm$0.03. This value decreases as we intentionally alter the photon pairwise indistinguishability. The low-depth and low-loss multiport interferometer design provides an efficient and scalable path to evaluate the genuine indistinguishability of resource states of increasing photon number.

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