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Updated: Jul 11, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Sub-nanotesla sensitivity at the nanoscale with a single spin.
Zhiyuan Zhao1,2, Xiangyu Ye1,2, Shaoyi Xu1,2
1CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
Researchers achieved nanoscale magnetic field detection sensitivity of 0.5 nT using nitrogen-vacancy defects in diamond. This breakthrough enhances quantum sensing for exploring fundamental physics and cellular life.
Area of Science:
- Quantum Sensing
- Condensed Matter Physics
- Biophysics
Background:
- Microscopic magnetic field detection is crucial across scientific disciplines.
- Achieving high sensitivity and spatial resolution simultaneously presents a significant measurement challenge.
Purpose of the Study:
- To develop a highly sensitive nanoscale magnetic field sensor.
- To overcome the inherent trade-off between sensitivity and spatial resolution in magnetic measurements.
Main Methods:
- Utilized nitrogen-vacancy (NV) defects in diamond with depths of tens of nanometers.
- Integrated advanced quantum techniques: real-time feedback initialization, shaped-pulse dynamical decoupling, and quantum logic-based repetitive readout.
Main Results:
- Achieved an experimental sensitivity of 0.5 nT at the nanoscale.
- Demonstrated substantial enhancement in sensitivity through the integration of multiple quantum techniques.
Conclusions:
- The developed NV-diamond magnetic sensor offers unprecedented sensitivity and spatial resolution.
- This technology has potential applications in searching for new physics, studying condensed matter magnetism, and detecting sub-cellular life activities.
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