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Abstract: Phase insensitive optical amplification of an unknown quantum state is knownto be a fundamentally noisy operation that inevitably adds noise to theamplified state 1 - 5. However, this fundamental noise penalty inamplification can be circumvented by resorting to a probabilistic scheme asrecently proposed and demonstrated in refs 6 - 8. These amplifiers are basedon highly non-classical resources in a complex interferometer. Here wedemonstrate a probabilistic quantum amplifier beating the fundamental quantumlimit utilizing a thermal noise source and a photon number subtraction scheme9. The experiment shows, surprisingly, that the addition of incoherent noiseleads to a noiselessly amplified output state with a phase uncertainty belowthe uncertainty of the state prior to amplification. This amplifier mightbecome a valuable quantum tool in future quantum metrological schemes andquantum communication protocols.

Autor: Mario A. Usuga, Christian R. Mueller, Christoffer Wittmann, Petr Marek, Radim Filip, Christoph Marquardt, Gerd Leuchs, Ulrik L. A


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