Entanglement Swapping with Semiconductor-Generated Photons Violates Bell’s Inequality

Michael Zopf, Robert Keil, Yan Chen, Jingzhong Yang, Disheng Chen, Fei Ding, and Oliver G. Schmidt
Phys. Rev. Lett. 123, 160502 – Published 14 October 2019
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Abstract

Transferring entangled states between photon pairs is essential in quantum communication. Semiconductor quantum dots are the leading candidate for generating polarization-entangled photons deterministically. Here we show for the first time swapping of entangled states between two pairs of photons emitted by a single dot. A joint Bell measurement heralds the successful generation of the Bell state Ψ+, yielding a fidelity of 0.81±0.04 and violating the CHSH and Bell inequalities. Our photon source matches atomic quantum memory frequencies, facilitating implementation of hybrid quantum repeaters.

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  • Received 4 March 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.160502

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Michael Zopf1, Robert Keil1, Yan Chen1, Jingzhong Yang1,2, Disheng Chen1, Fei Ding1,2,*, and Oliver G. Schmidt1,3,†

  • 1Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
  • 2Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
  • 3Material Systems for Nanoelectronics, Technische Universität Chemnitz, 09107 Chemnitz, Germany

  • *f.ding@fkp.uni-hannover.de
  • o.schmidt@ifw-dresden.de

See Also

Entanglement Swapping with Photons Generated on Demand by a Quantum Dot

F. Basso Basset, M. B. Rota, C. Schimpf, D. Tedeschi, K. D. Zeuner, S. F. Covre da Silva, M. Reindl, V. Zwiller, K. D. Jöns, A. Rastelli, and R. Trotta
Phys. Rev. Lett. 123, 160501 (2019)

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Vol. 123, Iss. 16 — 18 October 2019

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