QuTiP: An open-source Python framework for the dynamics of open quantum systems

TL;DR

QuTiP is an open-source Python framework designed for simulating the dynamics of open quantum systems, supporting complex Hamiltonians and various numerical solvers, useful for research and education in quantum physics.

Contribution

This paper introduces QuTiP, a versatile Python library that simplifies modeling and simulating open quantum systems with customizable Hamiltonians and efficient solvers.

Findings

Efficient performance compared to existing implementations

Supports arbitrary and time-dependent Hamiltonians

Suitable for research and educational purposes

Abstract

We present an object-oriented open-source framework for solving the dynamics of open quantum systems written in Python. Arbitrary Hamiltonians, including time-dependent systems, may be built up from operators and states defined by a quantum object class, and then passed on to a choice of master equation or Monte-Carlo solvers. We give an overview of the basic structure for the framework before detailing the numerical simulation of open system dynamics. Several examples are given to illustrate the build up to a complete calculation. Finally, we measure the performance of our library against that of current implementations. The framework described here is particularly well-suited to the fields of quantum optics, superconducting circuit devices, nanomechanics, and trapped ions, while also being ideal for use in classroom instruction.