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Related Experiment Video

Updated: Jun 23, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

Chiral quantum heating and cooling with an optically controlled ion.

Jin-Tao Bu^1,2, Jian-Qi Zhang¹, Ge-Yi Ding^1,2

¹State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071, Wuhan, China.

Light, Science & Applications

|June 25, 2024

Summary

Researchers achieved chiral quantum heating and refrigeration by encircling Liouvillian exceptional points in ultracold ions. This demonstrates a novel quantum thermodynamics effect with potential for quantum device applications.

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Last Updated: Jun 23, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Area of Science:

Quantum Thermodynamics
Non-Hermitian Physics
Quantum Information

Background:

Quantum heat engines and refrigerators are open quantum systems.
Non-Hermitian formalism describes their dynamics, featuring exceptional points (EPs).
Dynamical encirclement near EPs in classical systems induces chiral mode conversion.

Purpose of the Study:

To investigate chiral mode conversion in quantum systems near Liouvillian exceptional points (LEPs).
To demonstrate chiral quantum heating and refrigeration experimentally.
To explore the role of quantum jumps, noise, and Landau-Zener-Stückelberg processes in chiral quantum thermodynamics.

Main Methods:

Utilizing a Paul-trapped ultracold ion as a quantum system.
Dynamically encircling a closed loop in the vicinity of an LEP.
Analyzing thermodynamic cycles and heat exchange.

Main Results:

First experimental demonstration of chiral quantum heating and refrigeration.
Chirality of cycling direction correlates with heat release (engine) or absorption (refrigerator).
Adiabaticity breakdown and Landau-Zener-Stückelberg processes are crucial for chiral thermodynamic cycles.

Conclusions:

Dynamical encirclement near LEPs enables chiral quantum thermodynamics.
Chirality is a key feature in non-Hermitian quantum systems.
Findings advance understanding of topological and chiral phenomena in quantum thermodynamics.