Complete Analysis of Four-Photon χ-Type Entangled State via Cross-Kerr Nonlinearity

We propose an efficient method to construct an optical four-photon |χ state analyzer via the cross-Kerr nonlinearity combined with linear optical elements. In this protocol, two four-qubit parity-check gates and two controlled phase gates are employed. We show that all the 16 orthogonal four-qubit |...

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Bibliographic Details
Published in:理论物理通讯：英文版 2015 (9), p.281-286
Main Author: 曾志 李熙涵 王纯 汪粒粒 刘真真 魏华
Format: Article
Language:English
Subjects:
analysis
parity-check
gate
controlled
pha
state
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Summary:We propose an efficient method to construct an optical four-photon |χ state analyzer via the cross-Kerr nonlinearity combined with linear optical elements. In this protocol, two four-qubit parity-check gates and two controlled phase gates are employed. We show that all the 16 orthogonal four-qubit |χ states can be completely discriminated with our apparatus. The scheme is feasible and realizable with current technology. It may have useful potential applications in quantum information processing which based on |χ state.
ISSN:0253-6102