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Quantum channel correction outperforming direct transmission

Author

Listed:
  • Sergei Slussarenko

    (Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University)

  • Morgan M. Weston

    (Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University)

  • Lynden K. Shalm

    (National Institute of Standards and Technology)

  • Varun B. Verma

    (National Institute of Standards and Technology)

  • Sae-Woo Nam

    (National Institute of Standards and Technology)

  • Sacha Kocsis

    (Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University
    Centre for Quantum Computation and Communication Technology, The University of New South Wales)

  • Timothy C. Ralph

    (Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland)

  • Geoff J. Pryde

    (Centre for Quantum Dynamics and Centre for Quantum Computation and Communication Technology, Griffith University)

Abstract

Long-distance optical quantum channels are necessarily lossy, leading to errors in transmitted quantum information, entanglement degradation and, ultimately, poor protocol performance. Quantum states carrying information in the channel can be probabilistically amplified to compensate for loss, but are destroyed when amplification fails. Quantum correction of the channel itself is therefore required, but break-even performance—where arbitrary states can be better transmitted through a corrected channel than an uncorrected one—has so far remained out of reach. Here we perform distillation by heralded amplification to improve a noisy entanglement channel. We subsequently employ entanglement swapping to demonstrate that arbitrary quantum information transmission is unconditionally improved—i.e., without relying on postselection or post-processing of data—compared to the uncorrected channel. In this way, it represents realization of a genuine quantum relay. Our channel correction for single-mode quantum states will find use in quantum repeater, communication and metrology applications.

Suggested Citation

  • Sergei Slussarenko & Morgan M. Weston & Lynden K. Shalm & Varun B. Verma & Sae-Woo Nam & Sacha Kocsis & Timothy C. Ralph & Geoff J. Pryde, 2022. "Quantum channel correction outperforming direct transmission," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29376-4
    DOI: 10.1038/s41467-022-29376-4
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    References listed on IDEAS

    as
    1. Nissim Ofek & Andrei Petrenko & Reinier Heeres & Philip Reinhold & Zaki Leghtas & Brian Vlastakis & Yehan Liu & Luigi Frunzio & S. M. Girvin & L. Jiang & Mazyar Mirrahimi & M. H. Devoret & R. J. Schoe, 2016. "Extending the lifetime of a quantum bit with error correction in superconducting circuits," Nature, Nature, vol. 536(7617), pages 441-445, August.
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