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QUANTICS
A computer package solving the nuclear time-dependent Schrödinger equation to study fundamental molecular reactivity.

Quantics is a general purpose suite of codes designed to solve the time-dependent Schrödinger equation for molecular systems. It is based around accurate grid-based calculations and implements the powerful multi-configurational time-dependent Hartree algorithm in a number of different flavours. It also allows Gaussian Wavepacket propagations based on the G-MCTDH and vMCG algorithms, including the direct dynamics formulation of DD-vMCG to calculate potential surfaces on-the-fly. Trajectory based simulations of the evolving wavepacket are also possible, including trajectory surface hopping for non-adiabatic systems.

For further details of the capabilities of the package see

This documentation may not be be up-to-date. If you have installed the package, the latest documentation is under $MCTDH_DIR/doc/index.html.

Obtaining The Code

Quantics is hosted on the Gitlab development site. It is available on request by e-mail to g.a.worth@ucl.ac.uk. You will need a gitlab account https://www.gitlab.com
The older Heidelberg MCTDH package is still available on request. See the following web site for full details. To MCTDH Home Page

Quantics Tutorial

This tutorial covers the basic ideas of quantum dynamics and how to use Quantics.
Manual
Supporting Files
The Quantics Package
The following videos are recordings of presentations at the Quantics Training Day, UCL, Nov. 7th 2024.
Introduction to Quantum Dynamics and Quantics
Direct Dynamics and Quantics

Tutorial Videos

The following short videos form an introduction to using Quantics and running Quantum Dynamics simulations.

Theory Overview A brief overview of the main methods available in Quantics is given, with an aim of introducing the concepts and terms required to run calculations.
Setting up the Input Part 1 To set up the input, a few things must be initially thought about. These include the coordinated to be used, the Hamiltonian etc.
Setting up the Input Part 2 In the second part of setting up the input, the main two files required by Quantics to run a simulation are described, with examples.
Analysing the Results After running a simulation, the output must be analysed to check that the simulation is reasonable and to obtain observables from the evolving wavepacket. Here, an overview of the basic analysis to be run and examples of the analyse programs avaialble is given.
A Brief Demonstration In this final introductory video, a demonstration is given of how to run a and analyse a simulation.

The following short videos show how to run particular calculations.

Including a Light Pulse

The following tutorial from Hans-Dieter Meyer provides in-depth exercises to learn to use the MCTDH method.
A Tutorial

Developing The Code

To help developers, information on the code structure is included in the on-line documentation. The following videos also cover aspects of the code and implementations.

The following videos and slides are from a Demonstration workshop Feb. 22nd 2024.