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Chin. Phys. B, 2013, Vol. 22(3): 030313    DOI: 10.1088/1674-1056/22/3/030313
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Two-qubit and three-qubit controlled gates with cross-Kerr nonlinearity

Zhao Rui-Tong (赵瑞通)a, Guo Qi (郭奇)b, Cheng Liu-Yong (程留永)b, Sun Li-Li (孙立莉)b, Wang Hong-Fu (王洪福)a, Zhang Shou (张寿)a
a Department of Physics, College of Science, Yanbian University, Yanji 133002, China;
b Center for the Condensed-Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China
Abstract  Schemes for two-qubit and three-qubit controlled gates based on cross-Kerr nonlinearity are proposed in this paper. The success probability of these gates can be increased by the quantum nondemolition detectors which are used to judge which paths the signal photons pass through. These schemes are nearly deterministic and require no ancilla photon. The advantages of these gates over the existing ones include Less resource consumption and higher success probability, which make our schemes more feasible with current technology.
Keywords:  quantum controlled gates      cross-Kerr nonlinearity      quantum nondemolition detector  
Received:  30 July 2012      Revised:  10 September 2012      Accepted manuscript online: 
PACS:  03.67.-a (Quantum information)  
  03.67.Lx (Quantum computation architectures and implementations)  
  42.50.Ex (Optical implementations of quantum information processing and transfer)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61068001 and 11264042) and the Program for Chun Miao Excellent Talents of Department of Education of Jilin Province China (Grant No. 201316).
Corresponding Authors:  Zhang Shou     E-mail:

Cite this article: 

Zhao Rui-Tong (赵瑞通), Guo Qi (郭奇), Cheng Liu-Yong (程留永), Sun Li-Li (孙立莉), Wang Hong-Fu (王洪福), Zhang Shou (张寿) Two-qubit and three-qubit controlled gates with cross-Kerr nonlinearity 2013 Chin. Phys. B 22 030313

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