金刚石NV色心间基于电偶极耦合的快速受控非门  

An ultra-fast C-NOT gate based on electric dipole coupling between nitrogen-vacancy color centers

作　　者：史舜阳 季文韬 王亚[1,2,3,4] 杜江峰 Shi Shunyang;Ji Wentao;Wang Ya;Du Jiangfeng(Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory for Physical Sciences at the Microscale,Hefei 230026,China;CAS Key Laboratory of Microscale Magnetic Resonance,University of Science and Technology of China,Hefei 230026,China;Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学近代物理系,安徽合肥230026 [2]合肥微尺度物质科学国家研究中心,安徽合肥230026 [3]中国科学技术大学中科院微观磁共振实验室,安徽合肥230026 [4]中国科学技术大学量子信息与量子物理协同创新中心,安徽合肥230026

出　　处：《中国科学技术大学学报》2021年第3期185-192,共8页JUSTC

基　　金：National Key Research and Development Program of China(Nos.2018YFA0306600,2017YFA0305000);National Natural Science Foundation of China(Item Numbers:11775209,81788101,11761131011);Anhui Quantum Information Technology Leading Project(Item Number:AHY050000);Fundamental Research Funds for the Central Universities;USTC Research Funds of the Double First-Class Initiative.

摘　　要：提出了一种在金刚石中两个临近氮-空位色心(nitrogen-vacancy color center,简称NV色心)之间施加受控非门(C-NOT gate)的新方案.在该方案中,临近NV色心间的强电偶极耦合将导致态依赖的能级移动,从而施加可控的激光共振激发可以实现快速受控相位门(C-phase gate),结合单比特操作,可以快速实现C-NOT门.在两个相邻10 nm的NV色心之间,C-NOT门操作时间最快可达120 ns,比传统磁偶极方式快了2个量级.为了降低激发态自发辐射的影响,提出利用非共振腔抑制自发辐射.模拟结果显示C-phase门操控保真度可以达到98.88%.最后,将该方案扩展到一维NV色心自旋链.Our research proposes a new scheme to build a controlled-NOT(C-NOT)gate between two adjacent nitrogen-vacancy(NV)color centers in diamond,using electric dipole coupling between adjacent NVs and selective resonant laser excitation.The electric dipole coupling between two NVs causes the state dependent energy shift.This allows to apply resonant laser excitation to realize the C-phase gate.Combined with a single qubit operation,C-NOT gate can be implemented quickly.Between two adjacent 10 nm NVs,the C-NOT gate can operate up to 120 ns faster than the traditional magnetic dipole coupling method by 2 magnitudes.In order to reduce the effect of a spontaneous emission,we propose to use a non-resonant cavity to suppress the spontaneous emission.The simulation results show that the C-phase gate fidelity can reach 98.88%.Finally,the scheme is extended to a one-dimensional NV spin chain.

关 键 词：氮-空位色心 量子计算 受控非门 一维自旋链 

分 类 号：O413[理学—理论物理]