Photonics Research, 2020, 8 (8): 08001289, Published Online: Jul. 14, 2020   

Pulse-width-induced polarization enhancement of optically pumped N-V electron spin in diamond Download: 743次

Author Affiliations
1 School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, China
2 Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
3 Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
4 CAS Key Laboratory of Microscale Magnetic Resonance, University of Science and Technology of China, Hefei 230026, China
5 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
6 e-mail: bingchenphysics@hfut.edu.cn
7 e-mail: nyxu@hfut.edu.cn
8 e-mail: djf@ustc.edu.cn
Abstract
The nitrogen-vacancy (N-V) center in diamond is a widely used platform for quantum information processing and sensing. The electron-spin state of the N-V center could be initialized, read out optically, and manipulated by resonate microwave fields. In this work, we analyze the dependence of electron-spin initialization on widths of laser pulses. We build a numerical model to simulate this process and to verify the simulation results in experiments. Both simulations and experiments reveal that shorter laser pulses are helpful to the electron-spin polarization. We therefore propose to use extremely short laser pulses for electron-spin initialization. In this new scheme, the spin-state contrast could be improved about 10% in experiments by using laser pulses as short as 4 ns in width. Furthermore, we provide a mechanism to explain this effect, which is due to the occupation time in the meta-stable spin-singlet states of the N-V center. Our new scheme is applicable in a broad range of N-V-based applications in the future.

Yumeng Song, Yu Tian, Zhiyi Hu, Feifei Zhou, Tengteng Xing, Dawei Lu, Bing Chen, Ya Wang, Nanyang Xu, Jiangfeng Du. Pulse-width-induced polarization enhancement of optically pumped N-V electron spin in diamond[J]. Photonics Research, 2020, 8(8): 08001289.

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