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    Convex Optimization for Nonequilibrium Steady States on a Hybrid Quantum Processor

    Jonathan Wei Zhong Lau1, Kian Hwee Lim1, Kishor Bharti2,3, Leong-Chuan Kwek1,4,5,6, and Sai Vinjanampathy1,7,8,*

    • 1Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543
    • 2Joint Center for Quantum Information and Computer Science and Joint Quantum Institute, NIST/University of Maryland, College Park, Maryland 20742, USA
    • 3Institute of High Performance Computing (IHPC), Agency for Science Technology and Research (A*STAR), 1 Fusionopolis Way, No. 16-16 Connexis, Singapore 138632, Republic of Singapore
    • 4MajuLab, CNRS-UNS-NUS-NTU International Joint Research Unit, Singapore UMI 3654, Singapore
    • 5National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore
    • 6School of Electrical and Electronic Engineering Block S2.1, 50 Nanyang Avenue, Singapore 639798, Singapore
    • 7Department of Physics, Indian Institute of Technology-Bombay, Powai, Mumbai 400076, India
    • 8Centre of Excellence in Quantum Information, Computation, Science and Technology, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India

    • *sai@phy.iitb.ac.in

    Phys. Rev. Lett. 130, 240601 – Published 12 June, 2023

    DOI: https://doi.org/10.1103/PhysRevLett.130.240601

    Abstract

    Finding the transient and steady state properties of open quantum systems is a central problem in various fields of quantum technologies. Here, we present a quantum-assisted algorithm to determine the steady states of open system dynamics. By reformulating the problem of finding the fixed point of Lindblad dynamics as a feasibility semidefinite program, we bypass several well-known issues with variational quantum approaches to solving for steady states. We demonstrate that our hybrid approach allows us to estimate the steady states of higher dimensional open quantum systems and discuss how our method can find multiple steady states for systems with symmetries.

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