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Title: Simulations of frustrated Ising Hamiltonians using quantum approximate optimization

Abstract

Novel magnetic materials are important for future technological advances. Theoretical and numerical calculations of ground-state properties are essential in understanding these materials, however, computational complexity limits conventional methods for studying these states. Here we investigate an alternative approach to preparing materials ground states using the quantum approximate optimization algorithm (QAOA) on near-term quantum computers. We study classical Ising spin models on unit cells of square, Shastry-Sutherland and triangular lattices, with varying field amplitudes and couplings in the material Hamiltonian. We find relationships between the theoretical QAOA success probability and the structure of the ground state, indicating that only a modest number of measurements (≲100) are needed to find the ground state of our nine-spin Hamiltonians, even for parameters leading to frustrated magnetism. We further demonstrate the approach in calculations on a trapped-ion quantum computer and succeed in recovering each ground state of the Shastry-Sutherland unit cell with probabilities close to ideal theoretical values. The results demonstrate the viability of QAOA for materials ground state preparation in the frustrated Ising limit, giving important first steps towards larger sizes and more complex Hamiltonians where quantum computational advantage may prove essential in developing a systematic understanding of novel materials.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [1]; ORCiD logo [1];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Purdue Univ., West Lafayette, IN (United States)
  3. Purdue Univ., West Lafayette, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1905415
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
Additional Journal Information:
Journal Volume: 381; Journal Issue: 2241; Journal ID: ISSN 1364-503X
Publisher:
The Royal Society Publishing
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; quantum approximate optimization; Ising; quantum computing; frustrated magnetism; quantum simulation

Citation Formats

Lotshaw, Phillip C., Xu, Hanjing, Khalid, Bilal, Buchs, Gilles, Humble, Travis S., and Banerjee, Arnab. Simulations of frustrated Ising Hamiltonians using quantum approximate optimization. United States: N. p., 2022. Web. doi:10.1098/rsta.2021.0414.
Lotshaw, Phillip C., Xu, Hanjing, Khalid, Bilal, Buchs, Gilles, Humble, Travis S., & Banerjee, Arnab. Simulations of frustrated Ising Hamiltonians using quantum approximate optimization. United States. https://doi.org/10.1098/rsta.2021.0414
Lotshaw, Phillip C., Xu, Hanjing, Khalid, Bilal, Buchs, Gilles, Humble, Travis S., and Banerjee, Arnab. Mon . "Simulations of frustrated Ising Hamiltonians using quantum approximate optimization". United States. https://doi.org/10.1098/rsta.2021.0414. https://www.osti.gov/servlets/purl/1905415.
@article{osti_1905415,
title = {Simulations of frustrated Ising Hamiltonians using quantum approximate optimization},
author = {Lotshaw, Phillip C. and Xu, Hanjing and Khalid, Bilal and Buchs, Gilles and Humble, Travis S. and Banerjee, Arnab},
abstractNote = {Novel magnetic materials are important for future technological advances. Theoretical and numerical calculations of ground-state properties are essential in understanding these materials, however, computational complexity limits conventional methods for studying these states. Here we investigate an alternative approach to preparing materials ground states using the quantum approximate optimization algorithm (QAOA) on near-term quantum computers. We study classical Ising spin models on unit cells of square, Shastry-Sutherland and triangular lattices, with varying field amplitudes and couplings in the material Hamiltonian. We find relationships between the theoretical QAOA success probability and the structure of the ground state, indicating that only a modest number of measurements (≲100) are needed to find the ground state of our nine-spin Hamiltonians, even for parameters leading to frustrated magnetism. We further demonstrate the approach in calculations on a trapped-ion quantum computer and succeed in recovering each ground state of the Shastry-Sutherland unit cell with probabilities close to ideal theoretical values. The results demonstrate the viability of QAOA for materials ground state preparation in the frustrated Ising limit, giving important first steps towards larger sizes and more complex Hamiltonians where quantum computational advantage may prove essential in developing a systematic understanding of novel materials.},
doi = {10.1098/rsta.2021.0414},
journal = {Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences},
number = 2241,
volume = 381,
place = {United States},
year = {Mon Dec 05 00:00:00 EST 2022},
month = {Mon Dec 05 00:00:00 EST 2022}
}

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