Local Versus Global Two-Photon Interference in Quantum Networks

Thomas Nitsche, Syamsundar De, Sonja Barkhofen, Evan Meyer-Scott, Johannes Tiedau, Jan Sperling, Aurél Gábris, Igor Jex, and Christine Silberhorn
Phys. Rev. Lett. 125, 213604 – Published 20 November 2020
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Abstract

We devise an approach to characterizing the intricate interplay between classical and quantum interference of two-photon states in a network, which comprises multiple time-bin modes. By controlling the phases of delocalized single photons, we manipulate the global mode structure, resulting in distinct two-photon interference phenomena for time-bin resolved (local) and time-bucket (global) coincidence detection. This coherent control over the photons’ mode structure allows for synthesizing two-photon interference patterns, where local measurements yield standard Hong-Ou-Mandel dips while the global two-photon visibility is governed by the overlap of the delocalized single-photon states. Thus, our experiment introduces a method for engineering distributed quantum interferences in networks.

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  • Received 15 May 2020
  • Accepted 27 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.213604

© 2020 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Thomas Nitsche1, Syamsundar De1,*, Sonja Barkhofen1, Evan Meyer-Scott1, Johannes Tiedau1, Jan Sperling1, Aurél Gábris2,3, Igor Jex2, and Christine Silberhorn1

  • 1Applied Physics, Paderborn University, Warburger Straße 100, 33098 Paderborn, Germany
  • 2Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Praha 1–Staré Město, Czech Republic
  • 3Wigner Research Centre for Physics, Konkoly-Thege M. út 29–33, H-1121 Budapest, Hungary

  • *syamsundar.de@upb.de

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Issue

Vol. 125, Iss. 21 — 20 November 2020

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