What question did this study set out to answer?

The research aims to explore how dissipation rates can be tuned in an atom–cavity system using a nanotip.

March 25, 2026Open Access

In situ tuning of cavity dissipation and a topological transition in an atom–nanotip–cavity system

Key Points

The research aims to explore how dissipation rates can be tuned in an atom–cavity system using a nanotip.
Theoretical modeling of an atom–cavity system with a nanotip inserted into the cavity mode.
Estimation of the increase in the cavity dissipation rate.
Demonstration of obtaining an exceptional line when an atom or ion is coupled to the resonator.
Analysis of the position tuning of an exceptional point via decay rate adjustments.
Cavity dissipation rate increased by a factor of approximately 20 due to scattering and absorption losses.
Tuning the decay rate allows for the adjustment of the position of an exceptional point.
Enabled controlled quantum state switching in cavity quantum electrodynamics through scattering-induced dissipation.

Abstract

We theoretically investigate a method for tuning a dissipation rate in an atom–cavity system. By inserting a nanotip into the cavity mode, we estimate that the cavity dissipation rate increases by a factor of ∼20 due to the scattering and absorption losses at the tip. As applications of our in situ technique, we demonstrate that an exceptional line can be obtained when a single atom or ion is coupled to the resonator. Moreover, the position of an exceptional point is tuned by adjusting the decay rate, enabling a topological transition through dissipation control alone. Our study establishes a scattering-induced dissipation channel for probing the cavity field and enables controlled quantum state switching in cavity quantum electrodynamics.

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Ha et al. (Sun,) studied this question.

synapsesocial.com/papers/69c37bb3b34aaaeb1a67e58e — DOI: https://doi.org/10.1063/5.0297933

Authors

Taegyu Ha

Pohang University of Science and Technology

Kiyanoush Goudarzi

Pohang University of Science and Technology

Dowon Lee

Pohang University of Science and Technology

Journals

APL Photonics

Actions

Institutions

Pohang University of Science and Technology

Korea Research Institute of Standards and Science

References and Citations

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In situ tuning of cavity dissipation and a topological transition in an atom–nanotip–cavity system

Key Points

Abstract

Citation Network

Connected Papers

Discussion

Cite this study

Authors

Journals

Actions

Institutions

References and Citations

Citation Network

Connected Papers

Discussion