Quantum state comparison amplifier with feedforward state correction

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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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.