中国科学技术大学中国科学院量子信息重点实验室，安徽 合肥 230026
金刚石中的氮-空位（NV）色心在室温下具有稳定的荧光发射，超长的电子自旋相干时间以及许多优良的光学性质，可以对电磁场，温度进行高灵敏度表征。光纤传感技术近几年来发展迅速，在电力、化工、交通、医疗、环保及**等领域得到广泛应用。光纤体系由于其集成度、实用性高以及操作便捷性，且具有优良的传输光能力，损耗较低，可与NV色心结合，形成一种高集成化、高灵敏度的便捷性传感系统，未来将会作为传感器件投入到许多领域的应用中，例如对生物细胞、材料温度、磁场等物理量的高灵敏度测量。本综述主要介绍NV色心体系的光纤量子传感技术的工作原理、实现方式以及在相关领域的应用。
氮-空位色心 光纤 量子传感 激光与光电子学进展
2023, 60(11): 1106001
Haobin Lin 1,2,3Ce Feng 1,2,3Yang Dong 1,2,3Wang Jiang 1,2,3[ ... ]Fangwen Sun 1,2,3
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
4 National Key Laboratory of ASIC, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
Nitrogen-vacancy color centers can perform highly sensitive and spatially resolved quantum measurements of physical quantities such as magnetic field, temperature, and pressure. Meanwhile, sensing so many variables at the same time often introduces additional noise, causing a reduced accuracy. Here, a dual-microwave time-division multiplexing protocol is used in conjunction with a lock-in amplifier in order to decouple temperature from the magnetic field and vice versa. In this protocol, dual-frequency driving and frequency modulation are used to measure the magnetic and temperature field simultaneously in real time. The sensitivity of our system is about and , respectively. Our detection protocol not only enables multifunctional quantum sensing, but also extends more practical applications.
quantum sensing temperature measurement magnetic field measurement Chinese Optics Letters
2023, 21(1): 011201
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Hefei National Laboratory for Physical Science at Microscale, Department of Physics, University of Science and Technology of China, Hefei 230026, China
The nitrogen vacancy (NV) center in diamond has been well applied in quantum sensing of electromagnetic field and temperature, where the sensitivity can be enhanced by the number of NV centers. Here, we used electron beam irradiation to increase the generation rate of NV centers by nearly 22 times. We systematically studied the optical and electronic properties of the NV center as a function of an electron irradiation dose, where the detection sensitivity of magnetic fields was improved. With such samples with dense NV centers, a sub-pico-Tesla sensitivity in magnetic fields detection can be achieved with optimal controls and detections.
quantum sensing nitrogen vacancy center generation electron irradiation Chinese Optics Letters
2020, 18(8): 080201
昆明理工大学光电子新材料研究所， 云南 昆明 650093
采用固相法烧结制备了Ag掺杂的La2/3Ca1/3MnO3(LCMO∶Agx，x为摩尔分数，x=0.00，0.05，0.10)多晶靶材，并利用此靶材采用脉冲激光沉积法(PLD)在0°和15°LaAlO3(100)单晶衬底(单面抛光)上于790 ℃和45 Pa流动氧压下制备了LCMO∶Agx外延薄膜，并于760 ℃和104 Pa静态氧压下进行了30 min原位退火处理； X射线衍射(XRD)和ω-θ摇摆曲线分析表明所制备薄膜均沿［00l］方向生长，并且结晶质量较好，原子力显微镜(AFM)分析表明平均面光洁度较小，并且随Ag掺杂量的增加而变小；另外在倾斜衬底上生长的LCMO∶Agx薄膜上观察到激光感生电压(LIV)效应，并且随Ag掺杂浓度的增加，LCMO∶Agx薄膜的LIV信号的Up值先增大后减小，x=0.05时最大，x=0.10时最小，LIV信号响应时间τ则正好相反。
薄膜 La2/3Ca1/3MnO3∶Agx薄膜 脉冲激光沉积 原子力显微镜 激光感生电压
