Centre contributes software to new open source Quantum Simulator

Centre contributes software to new open source Quantum Simulator

Centre Research Software Engineer Ania Brown worked with QTechTheory researchers to develop the code for QuEST- the Quantum Exact Simulation Toolkit.

QuEST is a C-based simulator of quantum computers recently released by the Quantum Technology Theory Group QTechTheory, which is mainly based in the University of Oxford's Department of Materials.

Classical simulation of quantum computation is vital for the study of new algorithms and architectures, but is also notoriously difficult. Quantum systems evolve in a complicated way and keeping track of this evolution requires lots of computer memory and time.

Real quantum computers (of almost 50 qubits) are already becoming too large to simulate. QuEST combines several high performance classical computing techniques to simulate quantum computers at lightning speed and is an open source, OpenMP and MPI hybridised, GPU accelerated simulator written in C, capable of simulating generic quantum circuits of general single-qubit gates and many-qubit controlled gates.

QuEST is the first to make CPU, multiple CPU and GPU operation available through the same interface, and can be used to simulate quantum circuits too large to fit on a single computer.

A paper about the development of QuEST is available on arXiv, co-authored by Tyson Jones and Simon Benjamin from the Department of Materials and Ania Brown and Dr Ian Bush from the Oxford e-Research Centre. The QuEST toolkit is available to download from github.