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.
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)
基金
supported by the Fundamental Research Funds for the Central Universities(WK2030000020)
the National Natural Science Foundation of China(12005218).
关键词
双量子传感
氮-空位缺陷
量子控制
double-quantum sensing
nitrogen-vacancy center
quantum control
