Scientific Results

A high-fidelity noiseless amplifier for quantum light states

Year: 2011

Authors: Zavatta A., Fiurasek J., Bellini M.

Autors Affiliation: Istituto Nazionale di Ottica (INO-CNR), L.go E. Fermi 6, 50125 Florence, Italy; LENS and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy; Department of Optics, Palacky┬┤ University, 17. listopadu 12, 77146 Olomouc, Czech Republic.

Abstract: 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.

Journal/Review: NATURE PHOTONICS

Volume: 5 (1)      Pages from: 52  to: 56

More Information: A.Z. and M. B. acknowledge support from Ente Cassa di Risparmio di Firenze and Regione Toscana under project CTOTUS. J.F. acknowledges support from the Czech Ministry of Education under projects LC06007, MSM6198959213 and 7E08028, from the EU under the FET-Open project COMPAS (212008), and from the Czech Science Foundation under project GA202/08/0224.
KeyWords: Amplification scheme; Arbitrary quantum state; Coherent state; Experimental realizations; Linear amplifiers; Noiseless amplifier; Phase-insensitive amplifiers; Photon additions, Photonics, Quantum communication
DOI: 10.1038/nphoton.2010.260

Citations: 142
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