1. State Key Laboratory of Integrated OptoelectronicsCollege of Electronic Science and EngineeringJilin University Changchun 130012 P. R. China
2. Key Laboratory of Quantum Information of CASUniversity of Science and Technology of China Hefei Anhui 230026 P. R. China
3. Synergetic Innovation Center of Quantum Information & Quantum PhysicsUniversity of Science and Technology of China Hefei Anhui 230026 P. R. China
4. State Key Laboratory of Precision Measurement Technology and InstrumentsDepartment of Precision InstrumentTsinghua University Haidian Beijing 100084 P. R. China