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Coupled cluster downfolding techniques: a review of existing applications in classical and quantum computing for chemical systems

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arxiv 2303.00087 v1 pith:4PYZ2DSD submitted 2023-02-28 quant-ph

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keywords downfoldingquantumapplicationschemicalclustercoupledground-stateproblem
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In this manuscript, we provide an overview of the recent developments of the coupled cluster (CC) downfolding methods, where the ground-state problem of a quantum system is represented through effective/downfolded Hamiltonians defined using active spaces. All CC downfolding techniques discussed here are derived from a single-reference exponential ansatz for the ground-state problem. We discuss several extensions of the non-Hermitian and Hermitian downfolding approaches to the time domain and the so-called quantum flows. We emphasize the important role of downfolding formalisms in transitioning chemical applications from noisy quantum devices to scalable and error-corrected quantum computers.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Exact downfolding and its perturbative approximation

    cond-mat.str-el 2025-07 unverdicted novelty 6.0 of 10

    Derives an exact downfolded effective model by integrating out the rest space, states conditions for perturbative truncation, and formally recovers cRPA with corrections.

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