Hierarchy configuration interaction (hCI) has recently been introduced as an alternative
configuration interaction (CI) route combining excitation degree and seniority number and …

We propose a novel partitioning of the Hilbert space, hierarchy configuration interaction
(hCI), where the excitation degree (with respect to a given reference determinant) and the …

The Trotterized Unitary Coupled Cluster Single and Double (UCCSD) ansatz has recently
attracted interest due to its use in Variation Quantum Eigensolver (VQE) molecular …

In this work, we implement a generalized spin formulation of the doubly occupied
configuration interaction methodology using the energy variance of the N-electron …

PyCI is a free and open-source Python library for setting up and running arbitrary
determinant-driven configuration interaction (CI) computations, as well as their …

We show how to construct a linearly independent set of antisymmetrized geminal power
(AGP) states, which allows us to rewrite our recently introduced geminal replacement …

We consider wavefunctions built from antisymmetrized products of two‐electron
wavefunctions (geminals), which is arguably the simplest extension of the antisymmetrized …

ModelHamiltonian is a free, open source, and cross-platform Python library designed to
express model Hamiltonians, including spin-based Hamiltonians (Heisenberg and Ising …

This work proposes the variational determination of two-electron reduced density matrices
corresponding to the ground state of N-electron systems within the doubly occupied …

We discuss some strategies for extending recent geminal-based methods to open-shells by
replacing the geminal-creation operators with more general composite boson creation …