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| 1 | Optimizing ultrasensitive single electron magnetometer based on nitrogen-vacancy center in diamond显示文摘The measurement of the weak magnetic field in nanoscale resolution and at room temperature is always a significant topic in biological, physical, and material science. Such detection can be used to decide the characterization of the samples, such as cells, materials, and so on. Nitrogen-vacancy (NV) center in diamond has been proved to be able to detect a magnetic field with nano Tesla sensitivity and nanometer resolution at room temperature. Here we experimentally demonstrate an optimized NV center based single electron magnetometer in a commercial diamond and under a home-built optically detected magnetic resonance (ODMR) microscope. With current technology, we change the optically detected time window to get a better signal to noise ratio, and use dynamical decoupling to increase the slope of magnetic field amplitude versus fluorescence signal. By employing the 8-pulse XY-4 dynamical decoupling sequence we achieve a sensitivity of 18.9 nT (Hz)(1/2) , which is 1.7 times better than spin echo. We also propose a NV center based scanning diamond microscope for electron and nuclear spins detection as well as nanoscale magnetic resonance imaging. If it is realized, the NV center based magnetometry will have wide application in the future. | WANG PengFei JU ChenYong SHI FaZhan DU JiangFeng | 2013 | Chinese Science Bulletin2013，58，24： | 5 |
| 2 | Detection of radio-frequency field with a single spin in diamond显示文摘Detection of a.c. magnetic field is consequential for many developments in physical and biological sciences,and various designs of magnetometer have been proposed recently. However, the large size of sensor and the extreme measurement conditions required strongly limit their application. It remains a challenge to reconstruct the vector of a.c. field with nanoscale spatial resolution using a single spin under ambient conditions. In this work, we choose the radio-frequency(RF) field as a typical case and realize the measurement of RF field based on a nitrogen-vacancy(NV)center in diamond. We build a solid sensor through measuring the effect of RF field on NV electron spin energy levels and the transition between them. Both of the phase and amplitude(including the transverse and longitudinal components) are measured by this new approach. | Ying Liu Fei Kong Fazhan Shi Jiangfeng Du | 2016 | Science Bulletin2016，61，14： | 4 |
| 3 | Observation of non-Markovianity at room temperature by prolonging entanglement in solids显示文摘Open quantum systems are always exposed to an external environment,which result in interacting and exchanging information between quantum systems and their surroundings.The dynamics of real open quantum systems are often expected to deviate from the idealized Markovian process of losing information to their surrounding environment and to exhibit non-Markovian | Shijie Peng Xiangkun Xu Kebiao Xu Pu Huang Pengfei Wang Xi Kong Xing Rong Fazhan Shi Changkui Duan Jiangfeng Du | 2018 | Science Bulletin2018，63，6： | 1 |
| 4 | Quantum metrology with single spins in diamond under ambient conditions显示文摘The detection of single quantum systems can reveal information that would be averaged out in traditional techniques based on ensemble measurements. The nitrogen-vacancy(NV) centers in diamond have shown brilliant prospects of performance as quantum bits and atomic sensors under ambient conditions, such as ultra-long coherence time, high fidelity control and readout of the spin state. In particular, the sensitivity of the NV center spin levels to external environmental changes makes it a versatile detector capable of measuring various physical quantities, such as temperature, strain, electric fields and magnetic fields. In this paper, we review recent progress in NV-based quantum metrology, and speculate on its future. | ming chen chao meng qi zhang changkui duan fazhan shi jiangfeng du | 2018 | National Science Review2018，5，3： | 1 |
| 5 | Sub-nanotesla sensitivity at the nanoscale with a single spin显示文摘High-sensitivity detection of the microscopic magnetic field is essential in many fields.Good sensitivity and high spatial resolution are mutually contradictory in measurement,which is quantified by the energy resolution limit.Here we report that a sensitivity of 0.5 nT/(Hz)(1/2)at the nanoscale is achieved experimentally by using nitrogen-vacancy defects in diamond with depths of tens of nanometers.The achieved sensitivity is substantially enhanced by integrating with multiple quantum techniques,including real-time-feedback initialization,dynamical decoupling with shaped pulses and repetitive readout via quantum logic.Our magnetic sensors will shed new light on searching new physics beyond the standard model,investigating microscopic magnetic phenomena in condensed matters,and detection of life activities at the sub-cellular scale. | Zhiyuan Zhao Xiangyu Ye Shaoyi Xu Pei Yu Zhiping Yang Xi Kong Ya Wang Tianyu Xie Fazhan Shi Jiangfeng Du | 2023 | National Science Review2023，10，12： | 0 |
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