Digital Quantum Simulation of Non-Equilibrium Quantum Many-Body Systems

TL;DR

This paper demonstrates the use of IBM quantum computers to simulate non-equilibrium dynamics in quantum many-body systems, overcoming hardware limitations with error mitigation and optimized techniques, paving the way for large-scale quantum simulations.

Contribution

It introduces methods for simulating non-equilibrium quantum dynamics on current quantum hardware, highlighting practical approaches to mitigate noise and errors.

Findings

Successful simulation of spin and fermionic systems

Error mitigation improves simulation accuracy

Potential for large-scale light-matter interaction simulations

Abstract

Digital quantum simulation uses the capabilities of quantum computers to determine the dynamics of quantum systems, which are beyond the computability of modern classical computers. A notoriously challenging task in this field is the description of non-equilibrium dynamics in quantum many-body systems. Here we use the IBM quantum computers to simulate the non-equilibrium dynamics of few spin and fermionic systems. Our results reveal, that with a combination of error mitigation, noise extrapolation and optimized initial state preparation, one can tackle the most important drawbacks of modern quantum devices. The systems we simulate demonstrate the potential for large scale quantum simulations of light-matter interactions in the near future.