SimOS: A Python Framework for Simulations of Optically Addressable Spins

TL;DR

SimOS is an open-source Python framework enabling detailed simulation of optically addressable spins, supporting quantum system construction, evolution, and stochastic dynamics, useful for research and education.

Contribution

It introduces a flexible, backend-agnostic Python library for simulating multipartite quantum systems with optical and magnetic resonance features, including symbolic operator support.

Findings

Supports simulation of nitrogen-vacancy centers in diamond

Includes modules for photo-generated radical pairs

Facilitates educational demonstrations of magnetic resonance

Abstract

We present an open-source simulation framework for optically detected magnetic resonance, developed in Python. The framework allows users to construct, manipulate, and evolve multipartite quantum systems that consist of spins and electronic levels. We provide an interface for efficient time-evolution in Lindblad form as well as a framework for facilitating simulation of spatial and generalized stochastic dynamics. Further, symbolic operator construction and propagation is supported for simple model systems making the framework also ideal for use in classroom instruction of magnetic resonance. Designed to be backend-agnostic, the library leverages existing Python libraries as computational backends. We introduce the most important functionality and illustrate the syntax on a series of examples. These include systems such as the nitrogen-vacancy center in diamond and photo-generated spin-correlated radical pairs for which our library offers system-specific sub-modules.