Quantum state correction using a measurement-based feedforward mechanism

Donaldson, Ross J. and Mazzarella, Luca and Zanforlin, Ugo and Collins, Robert J. and Jeffers, John and Buller, Gerald S. (2019) Quantum state correction using a measurement-based feedforward mechanism. Physical Review A - Atomic, Molecular, and Optical Physics, 100 (2). 023840. ISSN 2469-9934 (https://doi.org/10.1103/PhysRevA.100.023840)

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Abstract

One of the weaknesses of quantum optical state postselection schemes is the low success probability. Typically there is a trade-off between amplifier properties such as success probability and output state fidelity. However, here we present a state comparison amplifier for optical coherent states, which features an active measurement and feedforward mechanism to correct for errors made during the initial amplification. The simple and relatively low latency mechanism allows us to correct for a binary phase alphabet. We demonstrate a significant simultaneous improvement in the amplifier characteristic parameters: output state fidelity, correct state fraction, and success probability. This demonstrates that nondeterministic quantum amplification can be enhanced significantly by measurement and feedforward.

ORCID iDs

Donaldson, Ross J., Mazzarella, Luca ORCID logoORCID: https://orcid.org/0000-0001-9173-3477, Zanforlin, Ugo, Collins, Robert J., Jeffers, John ORCID logoORCID: https://orcid.org/0000-0002-8573-1675 and Buller, Gerald S.;
  • Item type:Article
    ID code:69832
    Dates:
    Date
    Event
    26 August 2019
    Published
    25 July 2019
    Accepted
    Keywords:quantum optical state postselection schemes, optical-fiber communications, photonics, quantum key distribution, QKD, quantum bit error rate, QBER, state comparison amplifier, SCAMP, Optics. Light, Atomic and Molecular Physics, and Optics
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:19 Sep 2019 08:41
    Last modified:01 Nov 2023 11:17
    URI:https://strathprints.strath.ac.uk/id/eprint/69832
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