Heralded Distribution of Single-Photon Path Entanglement

P. Caspar, E. Verbanis, E. Oudot, N. Maring, F. Samara, M. Caloz, M. Perrenoud, P. Sekatski, A. Martin, N. Sangouard, H. Zbinden, and R. T. Thew
Phys. Rev. Lett. 125, 110506 – Published 10 September 2020
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Abstract

We report the experimental realization of heralded distribution of single-photon path entanglement at telecommunication wavelengths in a repeater-like architecture. The entanglement is established upon detection of a single photon, originating from one of two spontaneous parametric down-conversion photon pair sources, after erasing the photon’s which-path information. In order to certify the entanglement, we use an entanglement witness which does not rely on postselection. We herald entanglement between two locations, separated by a total distance of 2 km of optical fiber, at a rate of 1.6 kHz. This work paves the way towards high-rate and practical quantum repeater architectures.

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  • Received 24 April 2020
  • Accepted 30 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.110506

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

P. Caspar1, E. Verbanis1, E. Oudot1,2, N. Maring1, F. Samara1, M. Caloz1, M. Perrenoud1, P. Sekatski2, A. Martin1,*, N. Sangouard2,3, H. Zbinden1, and R. T. Thew1,†

  • 1Department of Applied Physics, University of Geneva, CH-1211 Genève, Switzerland
  • 2Quantum Optics Theory Group, University of Basel, CH-4056 Basel, Switzerland
  • 3Institut de physique théorique, Université Paris Saclay, CEA, CNRS, F-91191 Gif-sur-Yvette, France

  • *Present address: Université Côte d’Azur, CNRS, Institut de Physique de Nice, Parc Valrose, F-06108 Nice Cedex 2, France.
  • Robert.Thew@unige.ch

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Issue

Vol. 125, Iss. 11 — 11 September 2020

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