Indistinguishable photons from a trapped-ion quantum network node

M. Meraner, A. Mazloom, V. Krutyanskiy, V. Krcmarsky, J. Schupp, D. A. Fioretto, P. Sekatski, T. E. Northup, N. Sangouard, and B. P. Lanyon
Phys. Rev. A 102, 052614 – Published 19 November 2020

Abstract

Trapped atomic ions embedded in optical cavities are a promising platform to enable long-distance quantum networks and their most far-reaching applications. Here we achieve and analyze photon indistinguishability in a telecom-converted ion-cavity system. First, two-photon interference of cavity photons at their ion-resonant wavelength is observed and found to reach the limits set by spontaneous emission. Second, this limit is shown to be preserved after a two-step frequency conversion replicating a distributed scenario, in which the cavity photons are converted to the telecom C band and then back to the original wavelength. The achieved interference visibility and photon efficiency would allow for the distribution and practical verification of entanglement between ion-qubit registers separated by several tens of kilometers.

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  • Received 17 December 2019
  • Accepted 28 September 2020

DOI:https://doi.org/10.1103/PhysRevA.102.052614

©2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

M. Meraner1,2,*, A. Mazloom3,*, V. Krutyanskiy1,2,*, V. Krcmarsky1,2, J. Schupp1,2, D. A. Fioretto2, P. Sekatski3, T. E. Northup2, N. Sangouard4,3, and B. P. Lanyon1,2,†

  • 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 21A, 6020 Innsbruck, Austria
  • 2Institut für Experimentalphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
  • 3Departement Physik, Universität Basel, Klingelbergstraße 82, CH-4056 Basel, Switzerland
  • 4Institut de physique théorique, Université Paris Saclay, CEA, CNRS, F-91191 Gif-sur-Yvette, France

  • *These authors contributed equally to this work.
  • ben.lanyon@uibk.ac.at

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Issue

Vol. 102, Iss. 5 — November 2020

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