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Indirect communication between non-Markovian baths.

Ben S Humphries¹, Dale Green¹, Garth A Jones¹

¹Faculty of Science, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom.

The Journal of Chemical Physics

|November 26, 2025

Summary

This summary is machine-generated.

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Information transfer between two baths can occur without direct coupling, leading to complex non-Markovian dynamics in open systems. This study models this phenomenon using a novel two-bath approach.

Area of Science:

Quantum dynamics
Open quantum systems
Theoretical chemistry

Background:

Information transfer in quantum systems is crucial for understanding complex dynamics.
Previous models often simplify bath interactions, potentially missing key phenomena.

Purpose of the Study:

To investigate bath-system-bath-mediated information transfer without direct bath coupling.
To develop and analyze a new theoretical model for this phenomenon.

Main Methods:

Developed a novel two-bath model combining an overdamped Lorentz-Drude (LD) environment with an undamped oscillator (UO) bath.
Derived new hierarchical equations of motion (HEOM) for the Lorentz-Drude-Undamped-Oscillator (LDUO-HEOM) system.
Analyzed the model using expectation values of bath coordinates.

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Main Results:

Demonstrated information transfer between two baths even without direct coupling.
Revealed intricate non-Markovian dynamics in the open system due to bath-system-bath mediation.
Generated 2D electronic spectra in qualitative agreement with single-bath models, but without superfluous damping.

Conclusions:

The LDUO-HEOM model provides a robust framework for studying dissipation and relaxation in multi-bath systems.
Bath-system-bath-mediated information transfer is a significant factor in open quantum system dynamics.
This approach refines understanding of quantum dynamics by accurately accounting for bath interactions.