1. Shanxi University
2. State Key Laboratory of Quantum Optics and Quantum Optics Devices
3. Institute of Laser Spectroscopy
4. Wucheng Rd. 92
5. 030006 Taiyuan
6. Institute of Theoretical Physics
7. School of Physics and Electromechanical Engineering
8. Hexi University
9. Zhangye 734000
10. P. R. China
11. Joint Quantum Centre (JQC) Durham-Newcastle
12. Department of Chemistry
13. Durham University
14. South Road
15. Durham DH1 3LE