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Protecting classical-quantum signals in free-space optical channels

E. Villaseñor1, M. S. Winnel2, T. C. Ralph2, R. Aguinaldo3, J. Green3, and R. Malaney1

  • 1School of Electrical Engineering & Telecommunications, The University of New South Wales, Sydney, NSW 2052, Australia
  • 2Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, St Lucia, Queensland 4072, Australia
  • 3Northrop Grumman Mission Systems, San Diego, California 92123, USA

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Phys. Rev. A 107, 062616 – Published 30 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.062616

Abstract

Due to turbulence and tracking errors, free-space optical channels involving mobile transceivers are characterized by a signal's partial loss or complete erasure. This work presents an error-correction protocol capable of protecting a signal passing through such channels by encoding it with an ancillary entangled bipartite state. Beyond its ability to offer protection under realistic channel conditions, our protocol has the ability to transmit both a quantum state and a classical symbol using the same encoded state. We show how the protocol can improve the fidelity of transmitted coherent states over a wide range of losses and erasure probabilities relative to nonencoded direct transmission. In addition, the use of ancillary non-Gaussian entangled bipartite states in the signal encoding is considered, showing how this can increase performance. Finally, we briefly discuss the application of our protocol to the transmission of more complex input states, such as multimode entangled states.

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Outline

Information

Phys. Rev. A 107, 062616– Published 30 June, 2023
  • Received 3 February 2023
  • Accepted 8 June 2023
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