金刚石中氮空位中心在外加磁场下的电子自旋共振  

Dependence of Electronic Spin Resonance of Single Nitrogen Vacancy Center in Diamond on an External Magnetic Filed

作　　者：胡欣[1,2] 杨丽丽[2] 徐成伟[1] 赵琳峰[1] 张新霞[2] 刘艳芳[1] 

机构地区：[1]中国人民解放军63892部队 [2]中国科学院物理研究所固态量子信息与计算实验室

出　　处：《量子光学学报》2012年第4期382-388,共7页Journal of Quantum Optics

基　　金：国家基础研究973项目(2009CB929103);国家自然科学基金(10974251)

摘　　要：金刚石中单个氮空位中心的电子自旋在激光辐射下能够发出近红外的光致荧光,增加微波辐射可以对其进行量子调控,是室温条件下实现量子计算机的主要介质之一。本文利用激光共聚焦扫描显微系统观测到了金刚石晶体中氮空位中心的荧光二维扫描图,并通过二次相关函数测量验证了氮空位中心是单光子源。改变微波辐射频率得到了电子自旋共振谱,从而实现了对单个氮空位中心的量子调控。利用设计的可控静磁场研究了氮空位中心在不同磁场方向和大小时的光致荧光特性和自旋共振峰。实验结果表明两个电子自旋共振峰间的频率间距与静磁场的旋转角度成余弦函数关系,与理论分析结果一致。Electron spin of single nitrogen vacancy center in diamond can emit photoluminescence in infrared region under certain laser excitation. It can be manipulated by another low power microwave radiation and regarded as the main material to realize quantum computer at room temperature. Two-dimension image of nitrogen vacancy center in diamond is observed by laser confocal scanning system, si center as a good single-photon-sourcer is proved. Electron spin resonance spectrum is the microwave frequency, and the manipulation ngl ob e nitro tained gen vacancy by changing single nitrogen vacancy center is realized. Photoluminescence and spin resonance frequency of nitrogen vacancy center in different magnetic field is studied by designed controllable magnetic device. Experimental results show that the electron spin resonance frequencies exhibit as a function of cosine against different orientation of the magnetic field. On the other hand, we analyze the electron spin resonance frequencies in theory, which strongly demonstrate experimental results.

关 键 词：金刚石 氮空位中心 量子调控 电子自旋共振 

分 类 号：O431[机械工程—光学工程]