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Abstract: Noise is the price to pay when trying to clone or amplify arbitrary quantumstates. The quantum noise associated to linear phase-insensitive amplifiers canonly be avoided by relaxing the requirement of a deterministic operation. Herewe present the experimental realization of a probabilistic noiseless linearamplifier that is able to amplify coherent states at the highest level ofeffective gain and final state fidelity ever reached. Based on a sequence ofphoton addition and subtraction, and characterized by a significantamplification and low distortions, this high-fidelity amplification scheme maybecome an essential tool for quantum communications and metrology, by enhancingthe discrimination between partially overlapping quantum states or byrecovering the information transmitted over lossy channels.



Author: A. Zavatta, J. Fiurásek, M. Bellini

Source: https://arxiv.org/



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