作者机构:[1]Key Laboratory of Quantum Information,University of Science and Technology of China, Hefei 230026, China, [2]Electronic Technology Institute, Information Engineer University, Zhengzhou 450004, China
相关基金:Project supported by the National Fundamental Research Program of China (Grant No. 2006CB921900), National Natural Science Foundation of China (Grant Nos. 60537020 and 60621064), and the Innovation Funds of the Chinese Academy of Sciences.