Detection of Magnetic Field Gradient and Single Spin Using Optically Levitated Nano-Particle in Vacuum  

作　　者：Ke-Wen Xiao Lei-Ming Zhou Zhang-Qi Yin Nan Zhao 肖科文;周雷鸣;尹璋琦;赵楠(Beijing Computational Science Research Center,Beijing 100084,China;Center for Quantum Information,Institute for Interdisciplinary Information Sciences,Tsinghua University,Beijing 100084,China)

机构地区：[1]Beijing Computational Science Research Center,Beijing 100084,China [2]Center for Quantum Information,Institute for Interdisciplinary Information Sciences,Tsinghua University,Beijing 100084,China

出　　处：《Communications in Theoretical Physics》2018年第7期97-105,共9页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11374032,61435007,and 11704026;the Joint Fund of the Ministry of Education of China under Grant No.6141A02011604;NSAF(China)under Grant No.U1530401;National Key Research and Development Program of China under Grant No.2016YFA0301201

摘　　要：Optically levitated nano-particle with spins is a promising system for high-precision measurement and quantum information processing. We theoretically analyze the ratio between the fluctuation of particle's displacement caused by spins in magnetic field and caused by molecular collisions of the residual air. When the ratio is larger than unity, the displacement fluctuation of spins flipping can be remarkably detected. By theoretical analysis and numerical simulation, we propose and validate a scheme for the detection of gradient of the magnetic field by levitating ferromagnetic nano-particle, and also put forward a realizable detection scheme of the single spin by levitating nano-diamond particle with single nitrogen-vacancy(NV) centers.

关 键 词：optical tweezers spin detection the detection of magnetic field gradient 

分 类 号：O469[理学—凝聚态物理]