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Analysis of optical parity gates of generating Bell state for quantum information and secure quantum communication via weak cross-Kerr nonlinearity under decoherence effect

Authors
Heo, JinoHong, Chang-HoYang, Hyung-JinHong, Jong-PhilChoi, Seong-Gon
Issue Date
4월-2017
Publisher
SPRINGER
Keywords
Cross-Kerr nonlinearity; Parity gate; Bell state; Decoherence effect
Citation
QUANTUM INFORMATION PROCESSING, v.16, no.4
Indexed
SCIE
SCOPUS
Journal Title
QUANTUM INFORMATION PROCESSING
Volume
16
Number
4
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/84050
DOI
10.1007/s11128-017-1560-8
ISSN
1570-0755
Abstract
We demonstrate the advantages of an optical parity gate using weak cross-Kerr nonlinearities (XKNLs), quantum bus (qubus) beams, and photon number resolving (PNR) measurement through our analysis, utilizing a master equation under the decoherence effect (occurred the dephasing and photon loss). To generate Bell states, parity gates based on quantum non-demolition measurement using XKNL are extensively employed in quantum information processing. When designing a parity gate via XKNL, the parity gate can be diversely constructed according to the measurement strategies. In practice, the interactions of XKNLs in optical fiber are inevitable under the decoherence effect. Thus, by our analysis of the decoherence effect, we show that the designed parity gate employing homodyne measurement would not be expected to provide reliable quantum operation. Furthermore, compared with a parity gate using a displacement operator and PNR measurement, we conclude there is experimental benefit from implementation of a parity gate via qubus beams and PNR measurement under the decoherence effect.
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College of Science and Technology > Semiconductor Physics in Division of Display and Semiconductor Physics > 1. Journal Articles

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