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Photonic interface between subcarrier wave and dual-rail encodings

K. S. Melnik and E. S. Moiseev*

  • Kazan Quantum Center, Kazan National Research Technical University, 18a Chetaeva Str., Kazan 420111, Russia

  • *e.s.moiseev@kazanqc.org
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Phys. Rev. A 107, 052607 – Published 16 May, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.052607

Abstract

Quantum key distribution with multimode subcarrier wave encoding is propitious for being robust against environmental disturbance. For application in long-distance quantum communications, this encoding has to be compatible with entanglement-assisted quantum repeaters that are commonly designed to work with dual-rail encodings. We propose and demonstrate an interface between subcarrier wave and dual-rail encodings with a fidelity of 0.95±0.03 using a linear optical circuit. The developed scheme opens the way for future heterogeneous quantum networks that combine subcarrier wave quantum key distribution with trusted and nontrusted nodes.

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Outline

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Phys. Rev. A 107, 052607– Published 16 May, 2023
  • Received 4 April 2023
  • Accepted 8 May 2023
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