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

Andrea Crespi, Roberto Osellame*, Luca Innocenti, Marco Bentivegna, Roberta Ramponi, Fulvio Flamini, Nicolò Spagnolo, Niko Viggianiello, Paolo Mataloni, Fabio Sciarrino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)
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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.
Original languageEnglish
Article number10469
Number of pages8
JournalNature Communications
Issue number10469
Publication statusPublished - 04 Feb 2016


  • quantum
  • quantum information
  • photonics
  • quantum optics
  • boson sampling

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