Protecting single-photon entanglement with imperfect single-photon source

Protecting single-photon entanglement with imperfect single-photon source Photon noiseless linear amplification (NLA) is a powerful way to protect the single photon or single-photon entanglement (SPE) from photon loss. However, current NLA protocols for single photon or SPE usually require the local auxiliary single photon, but the ideal single-photon source is unavailable in current technology. In this paper, we investigate the NLA protocols for both single photon and SPE with imperfect single-photon source. We show that the quality of amplified quantum state greatly depends on the imperfect single-photon sources. The upper bound of the fidelity of the amplified quantum state is the fidelity of the single-photon source. In this way, in order to realize the amplification, we should require the fidelity of the single-photon source to be greater than the fidelity of the initial degraded state. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Quantum Information Processing Springer Journals

Protecting single-photon entanglement with imperfect single-photon source

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Publisher
Springer US
Copyright
Copyright © 2014 by Springer Science+Business Media New York
Subject
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
ISSN
1570-0755
eISSN
1573-1332
D.O.I.
10.1007/s11128-014-0886-8
Publisher site
See Article on Publisher Site

Abstract

Photon noiseless linear amplification (NLA) is a powerful way to protect the single photon or single-photon entanglement (SPE) from photon loss. However, current NLA protocols for single photon or SPE usually require the local auxiliary single photon, but the ideal single-photon source is unavailable in current technology. In this paper, we investigate the NLA protocols for both single photon and SPE with imperfect single-photon source. We show that the quality of amplified quantum state greatly depends on the imperfect single-photon sources. The upper bound of the fidelity of the amplified quantum state is the fidelity of the single-photon source. In this way, in order to realize the amplification, we should require the fidelity of the single-photon source to be greater than the fidelity of the initial degraded state.

Journal

Quantum Information ProcessingSpringer Journals

Published: Nov 26, 2014

References

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