QuTiP 2: A Python framework for the dynamics of open quantum systems

TL;DR

QuTiP 2 is an upgraded Python toolkit for simulating open quantum systems, featuring new solvers, improved performance, and enhanced API for better usability and compatibility.

Contribution

The paper introduces significant new features in QuTiP 2, including advanced solvers and formalism support, along with API improvements and increased compatibility.

Findings

Added efficient solvers for time-dependent Hamiltonians

Supported Floquet formalism and master equations

Enhanced performance and API consistency

Abstract

We present version 2 of QuTiP, the Quantum Toolbox in Python. Compared to the preceding version [Comput. Phys. Comm. 183 (2012) 1760], we have introduced numerous new features, enhanced performance, made changes in the Application Programming Interface (API) for improved functionality and consistency within the package, as well as increased compatibility with existing conventions used in other scientific software packages for Python. The most significant new features include efficient solvers for arbitrary time-dependent Hamiltonians and collapse operators, support for the Floquet formalism, and new solvers for Bloch-Redfield and Floquet-Markov master equations. Here we introduce these new features, demonstrate their use, and give a summary of the important backward-incompatible API changes introduced in this version.