Journal
NATURE PHOTONICS
Volume 5, Issue 1, Pages 52-56Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2010.260
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Funding
- Ente Cassa di Risparmio di Firenze
- Czech Ministry of Education [LC06007, MSM6198959213, 7E08028]
- EU [212008]
- Czech Science Foundation [GA202/08/0224]
- Regione Toscana
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Noise is the price to pay when trying to clone or amplify arbitrary quantum states. However, the quantum noise associated with linear phase-insensitive amplifiers can be avoided by relaxing the requirement of a deterministic operation. Here we present the experimental realization of a novel concept of a probabilistic noiseless linear amplifier that is able to amplify coherent states at the highest levels of effective gain and final state fidelity ever reached. Based on a sequence of photon addition and subtraction, this high-fidelity amplification scheme is likely to become an essential tool for applications of quantum communication and metrology.
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