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...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 3.4 nT=√Hz p and 1.3 mK=√Hz p,respectively.Our detection protocol not only enables multifunctional quantum sensing,but also extends more practical applications.展开更多
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 ...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.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12005218 and 52130510).
文摘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 3.4 nT=√Hz p and 1.3 mK=√Hz p,respectively.Our detection protocol not only enables multifunctional quantum sensing,but also extends more practical applications.
基金supported by the National Key Research and Development Program of China(No.2017YFA0304504)the National Natural Science Foundation of China(Nos.91536219 and 91850102)+2 种基金the Anhui Initiative in Quantum Information Technologies(No.AHY130000)the Science Challenge Project(No.TZ2018003)the Fundamental Research Funds for the Central Universities(No.WK2030000020)。
文摘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.
