Suppression law of quantum states in a 3D photonic fast Fourier transform chip

Andrea Crespi, Roberto Osellame (), Roberta Ramponi, Marco Bentivegna, Fulvio Flamini, Nicolò Spagnolo, Niko Viggianiello, Luca Innocenti, Paolo Mataloni and Fabio Sciarrino ()
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Andrea Crespi: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Roberto Osellame: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Roberta Ramponi: Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR)
Marco Bentivegna: Sapienza Università di Roma
Fulvio Flamini: Sapienza Università di Roma
Nicolò Spagnolo: Sapienza Università di Roma
Niko Viggianiello: Sapienza Università di Roma
Luca Innocenti: Sapienza Università di Roma
Paolo Mataloni: Sapienza Università di Roma
Fabio Sciarrino: Sapienza Università di Roma

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract The identification of phenomena able to pinpoint quantum interference is attracting large interest. Indeed, a generalization of the Hong–Ou–Mandel effect valid for any number of photons and optical modes would represent an important leap ahead both from a fundamental perspective and for practical applications, such as certification of photonic quantum devices, whose computational speedup is expected to depend critically on multi-particle interference. Quantum distinctive features have been predicted for many particles injected into multimode interferometers implementing the Fourier transform over the optical modes. Here we develop a scalable approach for the implementation of the fast Fourier transform algorithm using three-dimensional photonic integrated interferometers, fabricated via femtosecond laser writing technique. We observe the suppression law for a large number of output states with four- and eight-mode optical circuits: the experimental results demonstrate genuine quantum interference between the injected photons, thus offering a powerful tool for diagnostic of photonic platforms.

Date: 2016
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DOI: 10.1038/ncomms10469

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