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Single-Mode Magnon-Polariton Lasing and Amplification Controlled by Dissipative Coupling.

Zi-Qi Wang¹, Zi-Yuan Wang¹, Yi-Pu Wang¹

¹Zhejiang University, Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control, School of Physics, and State Key Laboratory for Extreme Photonics and Instrumentation, Hangzhou 310027, China.

Physical Review Letters

|November 17, 2025

Summary

This summary is machine-generated.

We achieved single-mode lasing of magnon polaritons using dissipative coupling in a cavity magnonic system. This breakthrough enables control over light-matter interactions for quantum technologies.

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Area of Science:

Quantum optics
Condensed matter physics
Cavity magnonics

Background:

Cavity magnonics explores light-matter interactions mediated by magnons.
Dissipative coupling is a key mechanism for controlling quantum systems.

Purpose of the Study:

To demonstrate single-mode lasing of magnon polaritons.
To investigate the role of dissipative coupling in cavity magnonic systems.
To explore new paradigms for light-matter interaction control.

Main Methods:

Utilizing a cavity magnonic system with a ferrimagnetic spin ensemble.
Implementing a feedback circuit to partially compensate the microwave cavity mode.
Tuning compensation and dissipative coupling strengths to control system cooperativity.

Main Results:

Achieved single-mode lasing of magnon polaritons at unity system cooperativity.
Observed the formation of a zero-linewidth polariton mode, a bound state in the continuum.
Demonstrated magnon-polariton amplification in the strong dissipative coupling regime.

Conclusions:

Dissipative coupling cooperativity is a critical parameter for controlling phase transitions in quantum systems.
Dissipative coupling provides an alternative method for tailoring light-matter interactions.
This work advances quantum technologies and information processing.