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Exceptional Point Superradiant Lasing with Ultranarrow Linewidth.

Min Du¹, Qian Bin², Qing-Yang Qiu¹

¹Huazhong University of Science and Technology, School of Physics and Institute for Quantum Science and Engineering, and Wuhan Institute of Quantum Technology, Wuhan 430074, China.

Physical Review Letters

|March 1, 2026

Summary

This summary is machine-generated.

Researchers achieved ultranarrow linewidth superradiant lasing using exceptional points (EP) in PT-symmetric systems. This breakthrough enhances atomic clock stability for quantum precision measurement.

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Area of Science:

Quantum physics
Atomic physics
Precision measurement

Background:

Superradiant lasing is key for atomic clock stability.
Achieving ultranarrow linewidths is a significant challenge.

Purpose of the Study:

To theoretically demonstrate superradiant lasing with ultranarrow linewidths using exceptional points (EP).
To enhance atomic clock stability for quantum precision measurement.

Main Methods:

Utilizing the exceptional point (EP) property in a PT-symmetric system.
Incoherently pumping optical lattice clock transitions of ultracold strontium-87 atoms.
Leveraging maximum atomic coherence at the EP to amplify superradiance.

Main Results:

Demonstrated theoretically superradiant lasing with linewidths in the μHz range.
Achieved high-power lasing sustained at the EP.
Obtained linewidths three orders of magnitude smaller than systems without EP.

Conclusions:

The exceptional point property significantly enhances superradiant lasing linewidth.
This method offers a promising pathway for developing highly stable and accurate atomic clocks.
Extends the application of superradiant lasing through the introduction of EP properties.