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Quantum Information Processing
Published in: Quantum Information Processing 8/2014

01-08-2014

Elementary quantum gates with Gaussian states

Authors: Sergey A. Podoshvedov, Jaewan Kim, Kisik Kim

Published in: Quantum Information Processing | Issue 8/2014

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Abstract

We study the question of converting initially Gaussian states into non-Gaussian ones by two- and three-photon subtraction to improve non-classical properties of the conditional optical fields. We show the photon subtraction may effectively generate non-Gaussian states only in case of small values of the mean values of the position and momentum operators. In particular, the photon-subtracted state can be made arbitrary close to Gaussian state in limiting case of large initial amplitude of displacement. Use of initial displacement in input Gaussian states opens wider prospects to manipulate them. In particular, realization of probabilistic Hadamard gate with input Gaussian states is discussed where photon subtraction is motive force able unevenly to increase measure of non-classicality of the output state. Subtraction of larger number of photons enables to increase fidelity and non-classical measure of the conditional states.
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Appendix
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Metadata
Title
Elementary quantum gates with Gaussian states
Authors
Sergey A. Podoshvedov
Jaewan Kim
Kisik Kim
Publication date
01-08-2014
Publisher
Springer US
Published in
Quantum Information Processing / Issue 8/2014
Print ISSN: 1570-0755
Electronic ISSN: 1573-1332
DOI
https://doi.org/10.1007/s11128-014-0764-4

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