Experimental realization of a nondeterministic optical noiseless amplifier

Linear amplifiers are necessarily affected by aminimal 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...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-06, Vol.83 (6), Article 063801
Main Authors: Ferreyrol, Franck, Blandino, Rémi, Barbieri, Marco, Tualle-Brouri, Rosa, Grangier, Philippe
Format: Article
Language:English
Subjects:
AMPLIFICATION
AMPLIFIERS
BOSONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPARATIVE EVALUATIONS
DATA
DETECTION
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
EVALUATION
EXPERIMENTAL DATA
INFORMATION
MASSLESS PARTICLES
MECHANICS
NOISE
NUMERICAL DATA
OPTICS
PHOTONS
Physics
QUANTUM MECHANICS
Quantum Physics
UNITARITY
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Summary:Linear amplifiers are necessarily affected by aminimal 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 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.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.83.063801