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Updated: Jun 11, 2025
11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
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Spectral densities, structured noise and ensemble averaging within open quantum dynamics.
Yannick Marcel Holtkamp1, Emiliano Godinez-Ramirez1, Ulrich Kleinekathöfer1
1School of Science, Constructor University, Campus Ring 1, 28759 Bremen, Germany.
The Journal of Chemical Physics
|October 1, 2024
Summary
Numerical integration of Schrödinger equation (NISE) methods are advanced for simulating larger quantum systems. New techniques improve long-time accuracy and enable simulations with structured spectral densities, aiding in calculating absorption spectra.
Area of Science:
- Quantum mechanics
- Computational chemistry
- Theoretical physics
Background:
- Numerically exact methods for open quantum systems are limited to small systems.
- Approximate methods like numerical integration of Schrödinger equation (NISE) are crucial for larger system simulations.
- Advancements in NISE are needed to extend its applicability.
Purpose of the Study:
- To improve the long-time behavior of the thermalized NISE scheme.
- To enable NISE simulations with structured spectral densities using a novel noise generation algorithm.
- To assess NISE's capability in calculating absorption spectra and population dynamics.
Main Methods:
- Modified ensemble-averaging procedure for thermalized NISE.
- Noise generating algorithm for arbitrary structured noise.
- Application of NISE to calculate absorption spectra and population dynamics.
Main Results:
- Improved long-time accuracy of the thermalized NISE scheme.
- Successful integration of NISE with structured spectral densities.
- Demonstrated utility of NISE for calculating absorption spectra and population dynamics.
Conclusions:
- The enhanced NISE approach extends the simulation capabilities for open quantum systems.
- The developed noise generation algorithm facilitates accurate spectral density determination.
- NISE is a powerful tool for studying quantum dynamics and optical properties.
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