基于量子调控高灵敏度双量子金刚石磁力计  

High-sensitivity double-quantum magnetometry in diamond via quantum control

作　　者：董杨 林豪斌 祝巍 孙方稳 Yang Dong;Haobin Lin;Wei Zhu;Fangwen Sun(CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China;Department of Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院量子信息重点实验室,安徽合肥230026 [2]中国科学院量子信息与量子物理卓越创新中心,安徽合肥230026 [3]中国科学技术大学合肥微尺度物质科学国家研究中心,安徽合肥230026 [4]中国科学技术大学物理系,安徽合肥230026

出　　处：《中国科学技术大学学报》2022年第3期18-23,69,共7页JUSTC

基　　金：supported by the Fundamental Research Funds for the Central Universities(WK2030000020);the National Natural Science Foundation of China(12005218).

摘　　要：高保真度量子比特控制对基于金刚石氮-空位磁力计实现起着十分重要的作用。但是,氮-空位色心的非平庸自旋-自旋相互作用常常导致能级劈裂,进而降低探测信号的对比度,最终导致磁力传感新能变坏。本文提出微波幅度调制的技术克服这一限制,允许实现探测信号对比度100%恢复。与传统磁力探测结果相比,双量子冉塞协议直流磁场探测信号对比度在实验上提高3倍。该方法可以直接推广到基于氮-空位色心温度、应力、电场传感,以及其他自旋-自旋耦合导致能级劈裂的体系。High-fidelity quantum operation of qubits plays an important role in magnetometry based on nitrogen-vacancy(NV)centers in diamonds.However,the nontrivial spin-spin coupling of the NV center decreases signal contrast and sens-itivity.Here,we overcome this limitation by exploiting the amplitude modulation of microwaves,which allows us to per-fectly detect magnetic signals at low fields.Compared with the traditional double-quantum sensing protocol,the full con-trast of the detection signal was recovered,and the sensitivity was enhanced three times in the experiment.Our method is applicable to a wide range of sensing tasks,such as temperature,strain,and electric field.

关 键 词：双量子传感 氮-空位缺陷 量子控制 

分 类 号：O77+3[理学—晶体学] TP212[自动化与计算机技术—检测技术与自动化装置]