1. State Key Laboratory of High Performance Computing; College of Computer; National University of Defense Technology; Changsha 410073 P. R. China
2. State Key Laboratory of Low-Dimensional Quantum Physics; Department of Physics; Tsinghua University; Beijing 100084 P. R. China
3. College of Optoelectronic Science and Engineering; National University of Defense Technology; Changsha 410073 P. R. China
4. Interdisciplinary Center of Quantum Information; National University of Defense Technology; Changsha 410073 P. R. China