The institute
FEMTO's news

You are here

Imaging quantum interference of entangled photon pairs of extremely high dimensionality

Researchers from the Optics Department have developed an imaging device allowing the spatial and temporal resolution of the phenomenon of quantum interference between pairs of entangled photons of extremely high dimensionality. This work paves the way for the development of very high dimensional information protocols.

In a crystal, photons of a laser beam can split in pairs of lower frequency, the spontaneous down conversion (SPDC) phenomenon. The so-called twin, or entangled, photons of a pair form a single quantum object. Therefore, if they are sent on a beam-splitter they exit randomly, but both on the same output port. This is the famous Hong-Ou-Mandel (HOM) two-photon interference.

HOM interference is used in novel communication protocols, like quantum teleportation and quantum information processing, but until now without spatial resolution, by using bucket detectors. However, entanglement concerns all properties of twin photons, including their position in space and time, and here HOM interference is obtained for thousands of spatial as well temporal resolution cells, resulting in a total spatio-temporal dimensionality of 3 million.

In our HOM interferometer, spatial coincidences at the output ports are imaged on two cameras operating in photon counting mode. Since we control temporally, spatially, in polarization and in wavelength the indistinguishability between the photons of a pair, we have observed and quantified spatially and temporally the HOM interference at the quantum level, with a visibility of 60%, of more than 4000 photon pairs of extremely large spatio-temporal dimensionality.

Given the essential role played by two-photon HOM interference in most of the systems developed for quantum information processing, demonstrating that HOM interference can be obtained by manipulating quantum states of giant dimensionality opens the way for the development of very high-dimensional quantum information protocols using space and time variables.

This work has just been published in the journal Physical Review X and is highlighted in the CNRS news

Contact : Fabrice Devaux

Référence :

Imaging spatio-temporal Hong-Ou-Mandel interference of biphoton state of extremely high Schmidt number, F. Devaux, A. Mosset P.A. Moreau, et E.Lantz .
Physical Review X, 2020.
DOI : 10.1103/PhysRevX.10.031031

  • FACS 2016 - The 13th International Conference on Formal Aspects of Component Software

    The DISC department, organizer of the 13th International Conference on FACS.

    Read more
  • Special issue of Comptes Rendus Physique on phononic crystals

    The May 2016 issue of Comptes Rendus Physique (an international peer-reviewed journal of the French Academy of Sciences), is devoted to phononic crystals. This special issue was coordinated by Vincent Laude.

    Read more
  • Paper prize at the international conference VPPC 2014

    At the International IEEE "Vehicle Power and Propulsion Conference" conference held in Coimbra, Portugal from 27 to 30 October 2014, “Hybrid & Fuel Cell Systems” Research Team of Femto-ST Institute won the Paper Prize for the paper titled “Energy management of an hybrid electrical vehicule in degraded operation”

    Read more
  • A book about flexible robotics co-written by Nicolas Chaillet

    The objective of the book "Flexible Robotics: Applications to Multiscale Manipulations" is to provide those interested in the field of flexible robotics with an overview of several scientific and technological advances in the practical field of robotic manipulation.

    Read more
  • Nonlinear Optics and Supercontinuum Symposium

    A one day “Nonlinear Optics and Supercontinuum Symposium” will be held on Friday 20 September in the Amphi FEMTO in honour of Professor Chinlon Lin who will be here in Besançon during this time.

    Read more
  • European Time and Frequency Seminar (EFTS)

    The European Frequency an Time Seminar (EFTS) will be held from Monday, August 16 to friday, August 30 2013.

    Read more
  • Two ERC Grants for FEMTO-ST Institute in 2011

    Prof John DUDLEY & Dr Yanne CHEMBO from the Optics Depmarment of FEMTO-ST Institute (UMR 6174 CNRS-Université de Franche-Comté) have both received a financial Grant from the European Research Council (ERC) to support the top level scientific excellence of their research projects

    Read more
  • Michel planat makes the Insights News of the Journal of Physics A: Mathematical and Theoretical

    Michel Planat's Insights news article "Quantum computing with Riemann hypothesis" is now available on the journal's website and can be viewed at http://iopscience.iop.org/1751-8121/labtalk-article/45421. This news article is based on the recent paper published by the Journal of Physics A: Mathematical and Theoretical.

    Read more
  • Summer school in Microrobotics and Self-assembly for hybrid MEMS

    The general context of the summer school concerns the micromanipulation and assembly of such complex microsystems. From the state-of-the-art, integration technologies for heterogeneous microsystems are based on Microrobotics or Self-assembly approaches.

    Read more
  • 4M conference 2010

    Co-organized by FEMTO-ST, 4 M conference will take place in Oyonnax (France) from November 17th to 19th.

    Read more

Pages