Quantum state correction using a measurement-based feedforward mechanism

Ross J. Donaldson; Luca Mazzarella; Ugo Zanforlin; Robert John Collins; John Jeffers; Gerald Stuart Buller

doi:10.1103/PhysRevA.100.023840

Quantum state correction using a measurement-based feedforward mechanism

Ross J. Donaldson, Luca Mazzarella, Ugo Zanforlin, Robert John Collins, John Jeffers, Gerald Stuart Buller

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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.

Original language	English
Article number	023840
Journal	Physical Review A
Volume	100
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevA.100.023840
Publication status	Published - 26 Aug 2019

Keywords

Quantum Communication
Quantum amplifier
Single-Photon
Quantum Coherent States

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Quantum state correction using a measurement-based feed-forward mechanism
Donaldson, R. J. (Creator), Mazzarella, L. (Contributor), Zanforlin, U. (Data Collector), Collins, R. J. (Contributor), Jeffers, J. (Contributor) & Buller, G. S. (Contributor), Heriot-Watt University, 31 Jul 2019
DOI: 10.17861/ad53d56d-fb18-4f56-824e-28f586aacce4
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title = "Quantum state correction using a measurement-based feedforward mechanism",

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.",

keywords = "Quantum Communication, Quantum amplifier, Single-Photon, Quantum Coherent States",

author = "Donaldson, {Ross J.} and Luca Mazzarella and Ugo Zanforlin and Collins, {Robert John} and John Jeffers and Buller, {Gerald Stuart}",

year = "2019",

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AU - Mazzarella, Luca

AU - Zanforlin, Ugo

AU - Collins, Robert John

AU - Jeffers, John

AU - Buller, Gerald Stuart

PY - 2019/8/26

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N2 - 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.

AB - 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.

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KW - Quantum amplifier

KW - Single-Photon

KW - Quantum Coherent States

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Quantum state correction using a measurement-based feedforward mechanism

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Quantum state correction using a measurement-based feed-forward mechanism

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