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Related Concept Videos

First Law: Particles in One-dimensional Equilibrium01:10

First Law: Particles in One-dimensional Equilibrium

Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If we...
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First Law: Particles in Two-dimensional Equilibrium

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Updated: May 27, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Communication: Partial linearized density matrix dynamics for dissipative, non-adiabatic quantum evolution.

Pengfei Huo1, David F Coker

  • 1Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA.

The Journal of Chemical Physics
|December 2, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a new method for simulating quantum dynamics in complex systems. The approach accurately models both quantum coherence and thermalization, offering a robust tool for condensed phase applications.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: December 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

  • Quantum Dynamics
  • Condensed Matter Physics
  • Theoretical Chemistry

Background:

  • Simulating quantum dynamics in dissipative systems at finite temperatures is computationally challenging.
  • Existing methods often struggle to capture both coherent and thermal aspects of quantum evolution.

Purpose of the Study:

  • To present a novel approach for treating dissipative, non-adiabatic quantum dynamics.
  • To demonstrate the method's capability in capturing short-time coherent dynamics and long-time thermal equilibration.

Main Methods:

  • Linearizing the density matrix evolution based on the forward-backward path difference for environmental degrees of freedom.
  • Applying the method to excitation energy transfer in photosynthetic light harvesting complexes and non-adiabatic scattering models.

Main Results:

  • The approach successfully captures short-time quantum coherence and long-time thermal equilibration in a model photosynthetic system.
  • Accurate prediction of electronic population branching through multiple avoided crossings in non-adiabatic scattering models.
  • Demonstrated robustness and reliability for treating quantum dynamical phenomena.

Conclusions:

  • The developed method provides a robust and reliable framework for simulating quantum dynamics in condensed phase systems.
  • It offers a "mean trajectory" like scheme capable of accurately describing complex quantum phenomena.
  • The approach is applicable to a wide range of quantum dynamical problems at finite temperatures.