金刚石氮-空位色心单电子自旋的电场驱动相干控制

Coherent electrical control of single electron spin in diamond nitrogen-vacancy center

金刚石氮-空位(nitrogen-vacancy,NV)色心量子体系因在室温条件下具有可实现单自旋寻址与操控、长量子相干时间等独特优势,在固态量子计算、量子精密测量等领域展现了巨大的应用潜力,其中单自旋的精确操控技术对于NV色心应用的发展尤为关键.NV色心量子体系中常用的自旋操控方法都是通过共振的交变磁场来驱动和操控NV色心电子自旋.本文开展了利用交变电场对NV色心电子自旋进行调控的技术研究.通过电极所产生的交变电场成功驱动了NV色心自旋在|m_(s)=−1>与|m_(s)=+1>两个Δm_(s)=±2的磁禁戒能级间的跃迁,并观测到受控自旋在相关能级的布居度周期性变化而展现出的Rabi振荡现象.进一步的研究表明,电场驱动Rabi振荡的频率受驱动电场功率的调控,与驱动电场的共振频率无直接关系.将自旋电控制技术与磁控制技术方法相结合,能够实现对NV色心3个自旋能级间直接跃迁的全操控.自旋电控制技术的发展将进一步推动NV色心量子体系在量子模拟、量子计算、电磁场的精密测量等领域研究和应用的发展.

The nitrogen-vacancy(NV)color center quantum system in diamond has shown great application potential in the fields of solid-state quantum computing and quantum precision measurement because of its unique advantages such as single-spin addressing and manipulation and long quantum coherence time at room temperature.The precise manipulation technology of single spin is particularly important for the development of the application of NV center.The common spin manipulation methods used in NV center quantum system are to drive and manipulate the electron spin by resonant alternating magnetic field.In recent years,the electrical control of quantum spin has attracted extensive attention.In this paper,using the alternating electric field to control the electron spin of NV center is studied.The alternating electric field generated by the electrode successfully drives the Rabi oscillation of the NV center spin between theΔm_(s)=±2 magnetic-dipole forbidden energy levels of|m_(s)=−1>and|m_(s)=+1>.Further studies show that the frequency of the electrically driven Rabi oscillation is controlled by the power of the driven electric field but independent of the resonant frequency of the electric field.The combination of spin electric control and magnetic control technology can realize the full manipulation of the direct transition among the three spin energy levels of NV center,thus promoting the development of the researches and applications of NV quantum system in the fields of quantum simulation,quantum computing,precision measurement of electromagnetic field,etc.