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quant-ph2023
Modular Cluster Circuits for the Variational Quantum Eigensolver
Seyed Ehsan Ghasempouri, Gerhard W. Dueck, Stijn De Baerdemacker
The variational quantum eigensolver (VQE) algorithm recently became a popular method to compute quantum chemical properties of molecules on noisy intermediate scale quantum (NISQ)…
cond-mat.str-el2023
Spin-constrained Hartree-Fock and the generator coordinate method for the 2-site Hubbard model
Stijn De Baerdemacker, Amir Ayati, Hugh G. A. Burton +3
We present a mathematical analysis of the spin-constrained Hartree-Fock solutions (CHF) of the 2-site Hubbard model. The analysis sheds light on the spin symmetry breaking process…