Quantum state comparison amplifier with feedforward state correction

L. Mazzarella; R. J. Donaldson; R. J. Collins; U. Zanforlin; G. Tatsi; G. S. Buller; J. Jeffers

doi:10.1117/12.2307818

21 May 2018 Quantum state comparison amplifier with feedforward state correction

L. Mazzarella, R. J. Donaldson, R. J. Collins, U. Zanforlin, G. Tatsi, G. S. Buller, J. Jeffers

Proceedings Volume 10674, Quantum Technologies 2018; 106741D (2018) https://doi.org/10.1117/12.2307818
Event: SPIE Photonics Europe, 2018, Strasbourg, France

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.

Citation Download Citation

L. Mazzarella, R. J. Donaldson, R. J. Collins, U. Zanforlin, G. Tatsi, G. S. Buller, and J. Jeffers "Quantum state comparison amplifier with feedforward state correction", Proc. SPIE 10674, Quantum Technologies 2018, 106741D (21 May 2018); https://doi.org/10.1117/12.2307818

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