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Proceedings Paper

High-fidelity noiseless amplification by photon addition and subtraction
Author(s): A. Zavatta; M. Locatelli; C. Polycarpou; J. Fiurášek; M. Bellini
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Paper Abstract

Fundamental laws of quantum mechanics impose that arbitrary quantum states cannot be perfectly cloned or amplified without introducing some unavoidable noise in the process. The quantum noise intrinsic to the functioning of a linear phase-insensitive amplifier can however be avoided by relaxing the requirement of a deterministic operation. Non-deterministic noiseless linear amplifiers that do not violate any fundamental quantum law are therefore possible and here we present the first experimental realization of a scheme that allows noiseless amplification of coherent states at the best level of effective gain and final state fidelity ever reached. This scheme, based on a sequence of photon addition and subtraction, and characterized by a significant amplification and low distortions, may become a useful tool for quantum communications and metrology, by enhancing the discrimination between partially overlapping quantum states or by recovering the information transmitted over lossy channels.

Paper Details

Date Published: 6 May 2011
PDF: 9 pages
Proc. SPIE 8072, Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing III, 80720P (6 May 2011); doi: 10.1117/12.887192
Show Author Affiliations
A. Zavatta, Istituto Nazionale di Ottica, CNR (Italy)
Univ. of Firenze (Italy)
M. Locatelli, Univ. of Firenze (Italy)
C. Polycarpou, Univ. of Firenze (Italy)
J. Fiurášek, Palacký Univ. Olomouc (Czech Republic)
M. Bellini, Istituto Nazionale di Ottica, CNR (Italy)
Univ. of Firenze (Italy)


Published in SPIE Proceedings Vol. 8072:
Photon Counting Applications, Quantum Optics, and Quantum Information Transfer and Processing III
Jaromír Fiurásek; Ivan Prochazka, Editor(s)

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