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.
(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).
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.