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

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