Institution: | 1. Department of Physics,Chifeng College,Chifeng 024001,China;Key Laboratory for Quantum Information and Measurements,Department of Physics,Tsinghua Univer sity,Beijing 100084,China 2. Key Laboratory for Quantum Information and Measurements,Department of Physics,Tsinghua Univer sity,Beijing 100084,China 3. Department of Physics,Liaoning Normal University,Dalian 116029,China 4. Key Laboratory for Quantum Information and Measurements,Department of Physics,Tsinghua Univer sity,Beijing 100084,China;Key Laboratory for Atomic and Molecular Nano-Sciences,Tsinghua University,Beijing 100084,China |