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Quantum Chemistry

Ground-state energies of Ising models calculated using the samples from a quantum computer that simulates short-time evolution

arXiv
Authors: John P. T. Stenger, C. Stephen Hellberg, Daniel Gunlycke

Year

2026

Paper ID

56667

Status

Preprint

Abstract Read

~2 min

Abstract Words

107

Citations

N/A

Abstract

We find the ground-state energy of the Ising model using the Cascaded Variational Quantum Eigensolver (CVQE) algorithm with the Guided-Sampling Ansatz (GSA) using up to 63 qubits on a quantum computer. We study a heavy-hex lattice to match the qubit architecture, allowing us to perform calculations in the quantum utility regime. We study both a homogeneous and random-coupling model. We locate the boundary of acceptable quantum errors as a function of the number of qubits and coupling strength. An entropic analysis is performed giving insights into the quantum computing performance. A subspace analysis is performed that suggests that the Ising model is especially suited for near-term quantum computing.

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  • We find the ground-state energy of the Ising model using the Cascaded Variational Quantum Eigensolver (CVQE) algorithm with the Guided-Sampling Ansatz (GSA) using up to 63...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2604.25715 [2] arXiv https://arxiv.org/abs/2604.25715 [3] Publisher https://arxiv.org/abs/2604.25715

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