Quantum state comparison amplifier with feedforward state correction

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Mazzarella, L. and Donaldson, R. J. and Collins, R. J. and Zanforlin, U. and Tatsi, G. and Buller, G. S. and Jeffers, J.; Stuhler, Jürgen and Shields, Andrew J. and Padgett, Miles J., eds. (2018) Quantum state comparison amplifier with feedforward state correction. In: Quantum Technologies 2018. SPIE, FRA. ISBN 9781510618749 (https://doi.org/10.1117/12.2307818)

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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.

ORCID iDs

Mazzarella, L. ORCID logoORCID: https://orcid.org/0000-0001-9173-3477, Donaldson, R. J., Collins, R. J. ORCID logoORCID: https://orcid.org/0000-0002-0433-4935, Zanforlin, U., Tatsi, G., Buller, G. S. and Jeffers, J. ORCID logoORCID: https://orcid.org/0000-0002-8573-1675; Stuhler, Jürgen, Shields, Andrew J. and Padgett, Miles J.
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