C++QED: a framework for simulating open quantum dynamics

TL;DR

C++QED is a versatile C++ framework designed for simulating open quantum systems, capable of handling complex interactions and large-scale quantum dynamics across various fields.

Contribution

It introduces a flexible, extendable framework for simulating open quantum systems, supporting complex interactions and large state spaces, with tools for custom element implementation.

Findings

Simulates full Master equations with thousands of dimensions.

Handles quantum trajectories with hundreds of thousands of dimensions.

Supports building complex quantum systems from elementary components.

Abstract

C++QED is a framework for simulating open quantum dynamics in general. Historically, it has in the first place been developed for problems in moving-particle cavity QED, but since then has been applied in other fields as well. It is known to be able to simulate full Master equation up to several thousand, and quantum trajectories up to several hundred thousand dimensions. The basic idea of the framework is to allow users to build arbitrarily complex interacting quantum systems from elementary free subsystems and interactions between them, and simulate their time evolution with a number of available time-evolution drivers. Apart from providing a number of elements out of the box, there are several tools which facilitate the implementation of new elements. These are being added continuously, on demand.