Experimental realization of a nondeterministic optical noiseless amplifier

Franck Ferreyrol, Rémi Blandino, Marco Barbieri, Rosa Tualle-Brouri, Philippe Grangier
2011 Physical Review A. Atomic, Molecular, and Optical Physics  
Linear amplifiers are necessarily affected by a minimal amount of noise, which is needed in order to preserve the linearity and the unitarity prescribed by quantum mechanics. Such a limitation might be partially overcome if the process is realized by conditioning its operation on a trigger event, for instance, the result of a measurement. Here we present a detailed analysis of a noiseless amplifier, implemented using linear optics, a down-conversion-based single-photon source, and single-photon
more » ... detection. Our results demonstrate an amplification adding a level of noise lower than the minimum allowed by quantum mechanics for deterministic amplifiers. This is made possible by the nondeterministic character of our device, whose success rate is sufficiently low not to violate any fundamental limit. We compare our experimental data to a model taking into account the main imperfections of the setup and find a good agreement.
doi:10.1103/physreva.83.063801 fatcat:g5bkudbdcfa4ffkeq7ybpon4ki