Highly efficient scheme for the implementation of optical controlled-Z gate via two-qubit polarization parity detector

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• 作者：Meng-Zheng Zhu^a ; ^{mzzhu@139.com} ; Chun-Ran Zhao^a ; Liu Ye^b ; ^{yeliu@ahu.edu.cn}
• 关键词：Cross-Kerr nonlinearity ; Quantum non-demolition measurement ; Controlled-Z gate
• 刊名：Optics Communications
• 出版年：2012
• 出版时间：15 March 2012
• 年：2012
• 卷：285
• 期：6
• 页码：1576-1580
• 全文大小：310 K

文摘

A new scheme is proposed to direct implement the optical two-qubit controlled-Z gate with the two-qubit polarization parity detector [Lin, et al., Phys. Rev. A. 80 (2009) 042311] based on weak cross-Kerr nonlinearity. The distinct advantage of the present scheme in contrast with the existing schemes is that the two-qubit polarization parity detector with classical information feed-forward allows the efficiency of our optical controlled-Z gate to be enormously enhanced due to avoiding effectively the photon bunching effects. Therefore, the present scheme is more efficient and more convenient than others in the applications of quantum communication.