A5038338197- Diamond and Carbon-based Materials Research
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- High-pressure geophysics and materials
- Force Microscopy Techniques and Applications
- Ion-surface interactions and analysis
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- Boron and Carbon Nanomaterials Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
- Electronic and Structural Properties of Oxides
- Graphene research and applications
- Mechanical and Optical Resonators
China Academy of Space Technology
2018-2025
Chinese Academy of Sciences
2017-2019
University of Science and Technology of China
2012-2018
Hefei National Center for Physical Sciences at Nanoscale
2012-2016
We presented a high-sensitivity temperature detection using an implanted single nitrogen-vacancy (NV) center array in diamond. The high-order thermal Carr-Purcell-Meiboom-Gill (TCPMG) method was performed on the NV diamond static magnetic field. demonstrated that under small detunings for two driving microwave frequencies, oscillation frequency of induced fluorescence equals approximately average fields. On basis conclusion, zero-field splitting D and corresponding could be determined....
We demonstrated a fiber-integrated diamond-based magnetometer in this paper. In the system, fluorescence of nitrogen vacancy (NV) centers nanodiamonds deposited on tapered fiber was coupled to effectively and detected at output end fiber. By using scheme, optically electron spin resonance spectra were recorded for single NV centers. The results confirmed that such fiber-nanodiamond system can act as magnetometer. Featured with excellent portability, convenient fabrication, potential further...
We investigated the depth dependence of coherence times nitrogen-vacancy (NV) centers through precise control using oxidative etching at 580 °C in air. By successive nanoscale etching, NV could be brought close to diamond surface step by step, which enabled us track evolution number remaining chip and study with etching. Our results showed that declined rapidly reduction last about 22 nm before they finally disappeared, revealed a critical for influence rapid fluctuating spin bath. Moreover,...
The inseparability criterion provides a straightforward and efficient method for identifying quantifying two-mode Gaussian quantum entanglement, making it crucial tool in optics experiments. However, is to recognize that the serves only as sufficient condition entanglement assessment, thereby posing risk of missed detection during evaluation. This paper investigates use assessing squeezed states, with particular focus on examining due asymmetry. results show when decoherence symmetrically...
In this work, we experimentally demonstrate energy transfer from a single negatively charged nitrogen-vacancy (NV) center in nanodiamond to graphene monolayer. The mode values of lifetime and intensity the fluorescence NV on monolayer are shorter weaker than that bare quartz substrate. efficiency is measured about 40%, consistent with our theoretical estimation.
We make use of inherent vacancies and nitrogen substitutions in nanodiamonds to generate nitrogen-vacancy (NV) centers by high temperature annealing. After 800 °C annealing, low photoluminescence intensity shows more than eight times improvement compared with that unannealed samples. Confocal microscope images well dispersed indicate a dramatically increased proportion containing NV after Optically detected magnetic resonance spectrum single center demonstrates the resultant are suitable for...
We investigated the influence of spins on surface nanodiamonds (NDs) to longitudinal relaxation time (T1) and transverse (T2) nitrogen vacancy (NV) centers in ND. A spherical model NDs was suggested account for experimental results T1 T2, density roughly estimated based statistical analysis 72 containing a single NV center. For studied here, center inside is highly dependent NDs. However, T2 center, intrinsic contributions must be much pronounced than that by spins. In other words, an more...
By efficient nanoscale plasma etching, the nitrogen-vacancy (NV) centers in diamond were brought to sample surface step by successfully. At each depth, we used relative ratios of spin coherence times before and after applying external spins on present decoherence, investigated relationships between depth ratios. The values declined then rised with decreasing which was attributed decoherence influenced spins, discrete effects electric field noise. Moreover, our work revealed a characteristic...
Developing gyroscopes based on quantum systems are important for inertial sensing applications, and its underlying physics is of fundamental interest. In this paper, we proposed a new type gyroscope the Berry phase generated during rotation system by using single 13C nuclear spin coupled with nearby nitrogen-vacancy center in diamond. Due to atom-scale size system, information can be obtained high spatial resolution. The manipulated at room temperature without need strong magnetic field,...
Arrays of NV centers in the diamond have potential fields chip-scale quantum information processing and nanoscale sensing. However, determining their orientations one by is resource intensive time consuming. Here, this paper, combining scanning confocal fluorescence images optical detected magnetic resonance, we realized a method identifying single with same orientation, which practicable high efficiency. In proof principle experiment, five orientation center array were identified. After...
Squeezed states, which have fewer fluctuations in one quadrature than vacuum noise at the expense of increasing other quadrature, can be used to enhance measurement accuracy, increase detection sensitivity, and improve fault tolerance performance for quantum information computation. In this paper, influences relative intensity (RIN) all-solid-state single-frequency laser fiber on squeezing factor squeezed states are experimentally theoretically studied. Here, an a each as light source system...