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

ORAL

Abstract

Digital quantum simulations (DQS) is a driving force behind the development of universal quantum computers. DQS uses the capabilities of quantum computers, such as superposition and entanglement, 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, because it defies the methods and principles of equilibrium physics.
Here we use the IBM quantum computers to simulate the non-equilibrium dynamics of few spin and fermionic systems. We explicitly include external perturbations, such as pulsed magnetic fields, to model excitation mechanisms in more realistic situations. 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.

Benedikt Fauseweh, Jian-Xin Zhu, arXiv:2009.07375 (2020)

*This work was carried out under the auspices of the U.S. DOE NNSA under Contract No. 89233218CNA000001, and was supported by the LANL LDRD Program.

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Presenters

  • Benedikt Fauseweh

    • Los Alamos National Laboratory

Authors

  • Benedikt Fauseweh

    • Los Alamos National Laboratory

  • Jian-Xin Zhu

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Theoretical Division/Center for Integrated Nanotechnology, Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Lab
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory