Quantum annealing in SK model employing Suzuki–Kubo–deGennes quantum Ising mean field dynamics

Soumyaditya Das (), Soumyajyoti Biswas () and Bikas K. Chakrabarti ()
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Soumyaditya Das: SRM University, AP
Soumyajyoti Biswas: SRM University, AP
Bikas K. Chakrabarti: Saha Institute of Nuclear Physics

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 10, 1-7

Abstract: Abstract We study a quantum annealing approach for estimating the ground state energy of the Sherrington–Kirpatrick mean field spin glass model using the Suzuki–Kubo–deGennes dynamics applied for individual local magnetization components. The solutions of the coupled differential equations, in discretized state, give a fast annealing algorithm (cost $$N^3$$ N 3 ) in estimating the ground state of the model: classical ( $$E^0= -0.7629 \pm 0.0002$$ E 0 = - 0.7629 ± 0.0002 ), quantum ( $$E^0=-0.7623 \pm 0.0001$$ E 0 = - 0.7623 ± 0.0001 ), and mixed ( $$E^0=-0.7626 \pm 0.0001$$ E 0 = - 0.7626 ± 0.0001 ), all of which are to be compared with the best known estimate $$E^0= -0.763166726 \dots $$ E 0 = - 0.763166726 ⋯ . We infer that the continuous nature of the magnetization variable used in the dynamics here is the reason for reaching close to the ground state quickly and also the reason for not observing the de-Almeida–Thouless line in this approach. Graphical abstract

Date: 2025
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DOI: 10.1140/epjb/s10051-025-01073-3

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