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Quantum-Dot-Based Telecommunication-Wavelength Quantum Relay

J. Huwer*, R. M. Stevenson, J. Skiba-Szymanska, M. B. Ward, and A. J. Shields

M. Felle

I. Farrer† and D. A. Ritchie

R. V. Penty

  • Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, United Kingdom

  • Toshiba Research Europe Limited, Cambridge Research Laboratory, 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, United Kingdom and Centre for Advanced Photonics and Electronics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0FA, United Kingdom

  • Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom

  • Centre for Advanced Photonics and Electronics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0FA, United Kingdom

  • *jan.huwer@crl.toshiba.co.uk
  • †Present address: Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom.
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Phys. Rev. Applied 8, 024007 – Published 16 August, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.8.024007

Abstract

The development of quantum relays for long-haul and attack-proof quantum communication networks operating with weak coherent laser pulses requires entangled photon sources at telecommunication wavelengths with intrinsic single-photon emission for most practical implementations. Using a semiconductor quantum dot emitting entangled photon pairs in the telecommunication O band, we demonstrate a quantum relay fulfilling both of these conditions. The system achieves a maximum fidelity of 94.5% for implementation of a standard four-state protocol with input states generated by a laser. We further investigate robustness against frequency detuning of the narrow-band input and perform process tomography of the teleporter, revealing operation for arbitrary pure input states, with an average gate fidelity of 83.6%. The results highlight the potential of semiconductor light sources for compact and robust quantum-relay technology that is compatible with existing communication infrastructures.

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Phys. Rev. Applied 8, 024007– Published 16 August, 2017
  • Received 20 April 2017

© 2017 American Physical Society

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