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Related Experiment Video

Updated: Apr 30, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Steady-state quantum coherence in driven open quantum system: An optimal transformation analysis.

Xiufeng Cao¹, Chen Wang², Georg Engelhardt³

¹Department of Physics, Xiamen University, Xiamen 361005, China.

The Journal of Chemical Physics

|April 28, 2026

Summary

This summary is machine-generated.

Researchers explored quantum coherence in driven open quantum systems, finding steady-state coherence is enhanced by broadening spectral densities through increased temperature and mixed baths. This work aids in engineering quantum coherence in nanoscale devices.

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Area of Science:

Quantum Physics
Open Quantum Systems

Background:

Quantum coherence is crucial for quantum technologies.
Protecting quantum coherence in open systems is a major challenge.
Standard models often predict vanishing steady-state coherence.

Purpose of the Study:

Investigate steady-state quantum coherence in a driven spin-boson model beyond the rotating-wave approximation.
Identify mechanisms to enhance and protect quantum coherence.
Provide a framework for engineering quantum coherence in nanoscale devices.

Main Methods:

Utilized a time-non-local master equation with a memory kernel.
Analyzed the overlap between spectral densities of Floquet quasifrequencies.
Studied resonance fluorescence spectra and Mollow triplet features.
Systematically varied driving parameters and bath properties.

Main Results:

Steady-state coherence becomes finite beyond standard approximations.
Coherence is linked to spectral density overlap.
Increased temperature and mixed baths enhance coherence by broadening spectral density.
Transverse coupling leads to Mollow triplet and near-maximal coherence under specific conditions.
Longitudinal coupling suppresses coherence.

Conclusions:

Developed a theoretical framework for understanding and enhancing steady-state quantum coherence.
Demonstrated the role of spectral density and bath properties in coherence.
Offers pathways for designing quantum devices with improved coherence properties.