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Title: Analytical solution for nonadiabatic quantum annealing to arbitrary Ising spin Hamiltonian

Abstract

Abstract Ising spin Hamiltonians are often used to encode a computational problem in their ground states. Quantum Annealing (QA) computing searches for such a state by implementing a slow time-dependent evolution from an easy-to-prepare initial state to a low energy state of a target Ising Hamiltonian of quantum spins, H I . Here, we point to the existence of an analytical solution for such a problem for an arbitrary H I beyond the adiabatic limit for QA. This solution provides insights into the accuracy of nonadiabatic computations. Our QA protocol in the pseudo-adiabatic regime leads to a monotonic power-law suppression of nonadiabatic excitations with time T of QA, without any signature of a transition to a glass phase, which is usually characterized by a logarithmic energy relaxation. This behavior suggests that the energy relaxation can differ in classical and quantum spin glasses strongly, when it is assisted by external time-dependent fields. In specific cases of H I , the solution also shows a considerable quantum speedup in computations.

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1864877
Alternate Identifier(s):
OSTI ID: 1876803
Report Number(s):
LA-UR-21-23292
Journal ID: ISSN 2041-1723; 2212; PII: 29887
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Published Article
Journal Name:
Nature Communications
Additional Journal Information:
Journal Name: Nature Communications Journal Volume: 13 Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Yan, Bin, and Sinitsyn, Nikolai A. Analytical solution for nonadiabatic quantum annealing to arbitrary Ising spin Hamiltonian. United Kingdom: N. p., 2022. Web. doi:10.1038/s41467-022-29887-0.
Yan, Bin, & Sinitsyn, Nikolai A. Analytical solution for nonadiabatic quantum annealing to arbitrary Ising spin Hamiltonian. United Kingdom. https://doi.org/10.1038/s41467-022-29887-0
Yan, Bin, and Sinitsyn, Nikolai A. Mon . "Analytical solution for nonadiabatic quantum annealing to arbitrary Ising spin Hamiltonian". United Kingdom. https://doi.org/10.1038/s41467-022-29887-0.
@article{osti_1864877,
title = {Analytical solution for nonadiabatic quantum annealing to arbitrary Ising spin Hamiltonian},
author = {Yan, Bin and Sinitsyn, Nikolai A.},
abstractNote = {Abstract Ising spin Hamiltonians are often used to encode a computational problem in their ground states. Quantum Annealing (QA) computing searches for such a state by implementing a slow time-dependent evolution from an easy-to-prepare initial state to a low energy state of a target Ising Hamiltonian of quantum spins, H I . Here, we point to the existence of an analytical solution for such a problem for an arbitrary H I beyond the adiabatic limit for QA. This solution provides insights into the accuracy of nonadiabatic computations. Our QA protocol in the pseudo-adiabatic regime leads to a monotonic power-law suppression of nonadiabatic excitations with time T of QA, without any signature of a transition to a glass phase, which is usually characterized by a logarithmic energy relaxation. This behavior suggests that the energy relaxation can differ in classical and quantum spin glasses strongly, when it is assisted by external time-dependent fields. In specific cases of H I , the solution also shows a considerable quantum speedup in computations.},
doi = {10.1038/s41467-022-29887-0},
journal = {Nature Communications},
number = 1,
volume = 13,
place = {United Kingdom},
year = {Mon Apr 25 00:00:00 EDT 2022},
month = {Mon Apr 25 00:00:00 EDT 2022}
}

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