Optimal architecture for a nondeterministic noiseless linear amplifier

Optimal architecture for a nondeterministic noiseless linear amplifier Nondeterministic quantum noiseless linear amplifiers are a new technology with interest in both fundamental understanding and new applications. With a noiseless linear amplifier it is possible to perform tasks such as improving the performance of quantum key distribution, purifying lossy channels, and distilling entanglement. Previous designs for noiseless linear amplifiers involving linear optics and photon counting are nonoptimal because they have a probability of success lower than the bound given by the theory of generalized quantum measurement. This paper develops a theoretical model using unitary interactions and projective measurements which reaches this limit. We calculate the fidelity and probability of success of this model for coherent states and Einstein-Podolsky-Rosen entangled states. Finally, we explore some examples of the complex interplay between the fidelity, probability, and the distilling and purifying power of the model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Optimal architecture for a nondeterministic noiseless linear amplifier

Physical Review A, Volume 89 (2): 9 – Feb 27, 2014
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Publisher
American Physical Society (APS)
Copyright
©2014 American Physical Society
Subject
ARTICLES; Quantum optics, physics of lasers, nonlinear optics, classical optics
ISSN
1050-2947
eISSN
1094-1622
D.O.I.
10.1103/PhysRevA.89.023846
Publisher site
See Article on Publisher Site

Abstract

Nondeterministic quantum noiseless linear amplifiers are a new technology with interest in both fundamental understanding and new applications. With a noiseless linear amplifier it is possible to perform tasks such as improving the performance of quantum key distribution, purifying lossy channels, and distilling entanglement. Previous designs for noiseless linear amplifiers involving linear optics and photon counting are nonoptimal because they have a probability of success lower than the bound given by the theory of generalized quantum measurement. This paper develops a theoretical model using unitary interactions and projective measurements which reaches this limit. We calculate the fidelity and probability of success of this model for coherent states and Einstein-Podolsky-Rosen entangled states. Finally, we explore some examples of the complex interplay between the fidelity, probability, and the distilling and purifying power of the model.

Journal

Physical Review AAmerican Physical Society (APS)

Published: Feb 27, 2014

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