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In the dynamic realm of billiards, a fascinating interplay of forces governs the motion of cue balls and stationary balls. When the cue ball collides with a stationary ball, linear momentum is exchanged. The cue ball imparts a fraction of its linear momentum to the stationary ball, causing the cue ball to decelerate while initiating the motion of the stationary ball.
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QC Lab: A Python Package for Quantum-Classical Dynamics.

Alex Krotz1, Antonio J Garzón-Ramírez1, Ethan Byrd1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

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|March 23, 2026
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Summary
This summary is machine-generated.

QC Lab is a new open-source Python package for quantum-classical (QC) dynamics simulations. It promotes QC algorithm development through a modular design, minimizing redundancy and maximizing code reuse for various model problems.

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Area of Science:

  • Computational Chemistry
  • Quantum Dynamics
  • Software Development

Background:

  • Quantum-classical (QC) dynamics simulations are crucial for understanding chemical processes.
  • Developing and applying QC algorithms often involves significant development effort and code redundancy.
  • A need exists for accessible, modular tools to facilitate QC research.

Purpose of the Study:

  • Introduce the first stable version of the QC Lab Python package.
  • Describe the modular design philosophy of QC Lab.
  • Promote the development and application of QC algorithms.

Main Methods:

  • Developed QC Lab as an open-source Python package.
  • Implemented a modular design for algorithms and models.
  • Decomposed QC algorithms into reusable tasks and ingredients.

Main Results:

  • The first stable version of QC Lab is now available.
  • The modular design facilitates cross-compatibility between algorithms and models.
  • Minimized development efforts and code redundancy through reusable components.

Conclusions:

  • QC Lab provides a flexible and efficient platform for QC dynamics simulations.
  • The package's design philosophy encourages broader adoption and development of QC algorithms.
  • QC Lab supports the application of QC methods to diverse model problems.