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Galvanometer

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...

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Updated: May 9, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Published on: June 9, 2016

Operating a non-Hermitian atomic magnetometer with programmable digital electronics.

Tianyu Qian^1,2, Jipeng Xu^1,3,4, Ran Huang⁵

¹College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China.

Nature Communications

|May 7, 2026

Summary

This summary is machine-generated.

We introduce a novel non-Hermitian system combining digital electronics and physical sensors to create and control exceptional points (EPs). This approach significantly enhances sensor sensitivity, demonstrated by a 4.27-fold increase in atomic magnetometer measurements.

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Area of Science:

Physics
Electronics
Quantum Sensing

Background:

Non-Hermitian systems with exceptional points (EPs) offer enhanced sensitivity but are difficult to control due to environmental disturbances.
Existing physical systems struggle with accurate generation and manipulation of EPs.

Purpose of the Study:

To propose a novel hybrid system for creating and controlling EPs using digital electronics and physical sensors.
To enhance the sensitivity of physical sensors through EP-enhanced responses.

Main Methods:

Developed a hybrid system integrating programmable digital electronics with physical sensors.
Utilized digital electronics to create, manipulate, and apply EPs.
Coupled the hybrid system with an atomic magnetometer to measure weak magnetic fields.

Main Results:

Achieved a 4.27-fold increase in sensitivity for weak magnetic field measurements.
Demonstrated the ability to easily and flexibly create and manipulate EPs.
Showcased the modular design's capability to couple with various physical sensors.

Conclusions:

The proposed hybrid non-Hermitian system offers a practical and programmable platform for enhanced sensing.
This approach bridges atomic physics, electronics, and non-Hermitian devices, opening new research avenues.
The system's programmability and scalability promise increased universality and intelligence in non-Hermitian applications.