Pulse-width-induced polarization enhancement of optically pumped N-V electron spin in diamond

• 作者: BING CHEN DAWEI LU FEIFEI ZHOU JIANGFENG DU NANYANG XU TENGTENG XING YA WANG YU TIAN YUMENG SONG ZHIYI HU
• 来源期刊: 光子学研究:英文版
• 学科: 工学
• 关键词: POLARIZATION PUMPED WIDTH
• 年，卷（期）: 2020,（8）
• 页码范围: 1289-1295
• 页数: 7页
• 分类号: TN2

摘要

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.