Shallow Electronic State Preparation for Quantum Chemistry with Quantum Monte Carlo Pre-Selection

• URL: http://arxiv.org/abs/2605.31139v1
• Date: Fri, 29 May 2026 10:47:49 GMT
• Title: Shallow Electronic State Preparation for Quantum Chemistry with Quantum Monte Carlo Pre-Selection
• Abstract summary: Quantum computers hold great promise for molecular simulation, but noise remains a fundamental obstacle.<n>We introduce a Quantum Monte Carlo (QMC) pre-screening procedure that constructs compact, physically motivated Givens rotation anstze tailored to realistic quantum hardware.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum computers hold great promise for molecular simulation, but noise remains a fundamental obstacle. We introduce a Quantum Monte Carlo (QMC) pre-screening procedure that constructs compact, physically motivated Givens rotation ansätze tailored to realistic quantum hardware. By identifying the most important wavefunction contributions early in a QMC simulation, we build circuits that are shallower that conventional alternatives while preserving number symmetry. Benchmarked on Quantinuum System Model H1, QMC-prescreened circuits outperform more complex ansätze under realistic noise conditions. The method offers a practical path toward chemical accuracy on quantum devices, by providing an adjustable trade-off between expressivity and circuit depth to generate shallow circuits suited to current high-noise devices, as well as deeper, more expressive circuits that can be deployed on future lower-noise devices.

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