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Proceedings Paper

Quantum state comparison amplifier with feedforward state correction
Author(s): L. Mazzarella; R. J. Donaldson; R. J. Collins; U. Zanforlin; G. Tatsi; G. S. Buller; J. Jeffers
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Paper Abstract

Quantum mechanics imposes stringent constraints on the amplification of a quantum signal. Deterministic amplification of an unknown quantum state always implies the addition of a minimal amount of noise. Linear and noiseless amplification is allowed in principle provided that it only works probabilistically. Here we present a probabilistic amplifier that combines two quantum state comparison amplifiers (SCAMP) together with a feed-forward state correction strategy. Our system outperforms the unambiguous state discrimination (USD) measure-and-resend based amplifier in terms of the success probability-fidelity product and requires a more complex experimental setting.

Paper Details

Date Published: 21 May 2018
PDF: 9 pages
Proc. SPIE 10674, Quantum Technologies 2018, 106741D (21 May 2018); doi: 10.1117/12.2307818
Show Author Affiliations
L. Mazzarella, Univ. of Strathclyde (United Kingdom)
R. J. Donaldson, Heriot-Watt Univ. (United Kingdom)
R. J. Collins, Heriot-Watt Univ. (United Kingdom)
U. Zanforlin, Heriot-Watt Univ. (United Kingdom)
G. Tatsi, Univ. of Strathclyde (United Kingdom)
G. S. Buller, Heriot-Watt Univ. (United Kingdom)
J. Jeffers, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 10674:
Quantum Technologies 2018
Jürgen Stuhler; Andrew J. Shields; Miles J. Padgett, Editor(s)

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