2024
DOI: 10.1021/acs.jctc.4c00915
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Subspace-Search Quantum Imaginary Time Evolution for Excited State Computations

Cameron Cianci,
Lea F. Santos,
Victor S. Batista

Abstract: Quantum systems in excited states are attracting significant interest with the advent of noisy intermediate-scale quantum (NISQ) devices. While ground states of small molecular systems are typically explored using hybrid variational algorithms like the variational quantum eigensolver (VQE), the study of excited states has received much less attention, partly due to the absence of efficient algorithms. In this work, we introduce the subspace search quantum imaginary time evolution (SSQITE) method, which calcula… Show more

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