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A state-of-the-art quantum transport simulator.
A first-class quantum transport simulator.
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Our most powerful solution for first-principles materials simulation.
Allows finite element modeling for computer-aided design of quantum-technology hardware.
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QTCAD® version 1.2 is now available!

June 13th, 2024

A new version of QTCAD® has just been released!


We are happy to release a new,  major, and extensive update to QTCAD®, which should please our users and current testers.


Main updates and new features in this version 1.2.0 are the following:

  • Extended and accelerated workflow for the calculation of the electronic structure and charge stability properties of systems containing one or a few quantum dots, including:

> NEW lever arm matrix solver enabling to quantitatively assess the importance of cross-capacitive effects in multiple dot systems.

> More flexible many-body solver enabling instantiation from single-electron energy levels, Coulomb interaction matrix, and lever arm matrix instead of a full Device object.

> The possibility to neglect overlap terms in the Coulomb interactions of a quantum-dot system, leading to the Fermi-Hubbard model.

> Particle addition spectrum calculator for near-equilibrium quantum-dot systems.

> NEW method to calculate the average total number of electrons using the many-body solver.

> The possibility to solve the many-body problem in a list of user-specified N-particle subspaces only.

  • Strain solver for electrons or holes enabling to calculate conduction-band edge shifts and valence-band mixing effects within the Bir-Pikus Hamiltonian or in alternative user-defined strain models.
  • NEW hybrid 3D/1D quantum-well Schrödinger-Poisson solver enabling to account for quantum confinement along a single spatial direction, leading to more accurate modeling of semiclassical charge reservoirs in two-dimensional electron or hole gases.
  • Full support for Schrödinger-Poisson simulations in 1D and 3D devices with holes as confined carriers.
  • Operators module enabling to calculate the matrix representation of arbitrary functions of spatial coordinates in the basis of the eigenstates of the single-particle Hamiltonian, which can be integrated in a straightforward manner with third-party master equation solvers like QuTiP.
  • Improved and generalized hole-compatible electric-dipole spin resonance (EDSR) workflow based on the new operators module.
  • Support for spatially varying Fermi level enabling to model source-drain biases in near-equilibrium configurations.
  • Added the following items to the materials module: Ge, SiGe alloy with tunable Ge concentration, AlGaAs with tunable Al concentration.
  • NEW dopant concentration setter compatible with arbitrary functions of Cartesian coordinates.
  • More modular and intuitive solver-parameter system with distinct SolverParams classes in module defining a Solver class.
  • Support for Jupyter notebooks.
  • An improved and streamlined installation and license activation process.


While we celebrate its first anniversary as a commercial product, our quantum modeling software keeps gaining more powerful and relevant features, answering the needs of the quantum-hardware design community. We are also very proud to announce that QTCAD® is now used by many customers around the world, including Universities and companies.

Thank you so much to all of you for your trust and interest in our unique tool!

To join the QTCAD® community, please simply create your user account and login on our User Portal to download and test it:

Also, the documentation has been updated accordingly, please check out: QTCAD 1.2 — QTCAD 1.2 documentation (

We are even harder at work now that we have a new office in Sherbrooke’s Innovation Zone connected to the other key local and international quantum technology players! Follow us on LinkedIn for more exciting news to come.

Thank you very much for your continued support.

The QTCAD Team.