Implementation of a non-deterministic optical noiseless amplifier

Abstract : Quantum mechanics imposes that any amplifier that works independently on the phase of the input signal has to introduce some excess noise. The impossibility of such a noiseless amplifier is rooted into unitarity and linearity of quantum evolution. A possible way to circumvent this limitation is to interrupt such evolution via a measurement, providing a random outcome able to herald a successful - and noiseless - amplification event. Here we show a successful realisation of such an approach; we perform a full characterization of an amplified coherent state using quantum homodyne tomography, and observe a strong heralded amplification, with about 6dB gain and a noise level significantly smaller than the minimal allowed for any ordinary phase-independent device.
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Franck Ferreyrol, Marco Barbieri, Rémi Blandino, Simon Fossier, Rosa Tualle-Brouri, et al.. Implementation of a non-deterministic optical noiseless amplifier. Physical Review Letters, American Physical Society, 2010, 104, pp.123603. ⟨10.1103/PhysRevLett.104.123603⟩. ⟨hal-00553571⟩

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