Unified adiabatic and diabatic excited-state description via the ensemble-variational quantum eigensolver
Abstract
Within the present noisy intermediate-scale quantum-computing era, hybrid quantum-classical-processor algorithms have emerged as promising avenues for tackling electronic-structure eigenproblems. Among them, the so-called ensemble-variational quantum eigensolver has been designed to treat ground and excited states on an equal footing and proven effective in capturing features such as conical intersections and avoided crossings between two electronic states, as we recently demonstrated for formaldimine. We also showed on that example how the underlying ensemble-variational principle was prone to provide a quasi-diabatic representation "for free". To date, this method has been limited to computing only two eigenstates of a Hamiltonian. The aim of the present paper is to show how and under what conditions this can be generalized to models that involve three coupled electronic states or more. Our approach relies on designing a parameterized basis transformation that can directly be implemented on a quantum computer for further post-treatment. This nontrivial step is accompanied by the development of quantum circuits specifically adapted to the several states of interest. An algebraic optimization strategy for the parameters of the basis transformation is formulated to obtain the target eigenstates as well as the optimally diabatic states under various objective flavors of the ensemble-variational principle. Our approach was tested for addressing the first three coupled electronic states of the H + 4 molecular ion as a proof of principle, with three electrons in four spatial orbitals, along various geometries.
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BibTeX
@article{soule2026unified,
title = {{Unified adiabatic and diabatic excited-state description via the ensemble-variational quantum eigensolver}},
author = {Christophe Soule and Bruno Senjean and Benjamin Lasorne},
journal = {Faraday Discussions},
year = {2026},
month = may,
doi = {10.1039/d6fd00064a},
eprint = {2604.17317},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05849663v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Unified adiabatic and diabatic excited-state description via the ensemble-variational quantum eigensolver
AU - Christophe Soule
AU - Bruno Senjean
AU - Benjamin Lasorne
PY - 2026
DA - 2026/05/28
JO - Faraday Discussions
DO - 10.1039/d6fd00064a
UR - https://hal.science/hal-05849663v1
AB - Within the present noisy intermediate-scale quantum-computing era, hybrid quantum-classical-processor algorithms have emerged as promising avenues for tackling electronic-structure eigenproblems. Among them, the so-called ensemble-variational quantum eigensolver has been designed to treat ground and excited states on an equal footing and proven effective in capturing features such as conical intersections and avoided crossings between two electronic states, as we recently demonstrated for formaldimine. We also showed on that example how the underlying ensemble-variational principle was prone to provide a quasi-diabatic representation "for free". To date, this method has been limited to computing only two eigenstates of a Hamiltonian. The aim of the present paper is to show how and under what conditions this can be generalized to models that involve three coupled electronic states or more. Our approach relies on designing a parameterized basis transformation that can directly be implemented on a quantum computer for further post-treatment. This nontrivial step is accompanied by the development of quantum circuits specifically adapted to the several states of interest. An algebraic optimization strategy for the parameters of the basis transformation is formulated to obtain the target eigenstates as well as the optimally diabatic states under various objective flavors of the ensemble-variational principle. Our approach was tested for addressing the first three coupled electronic states of the H + 4 molecular ion as a proof of principle, with three electrons in four spatial orbitals, along various geometries.
SN - 1359-6640
SN - 1364-5498
ER -