Abstract: Calculation control for hybrid computing of Hamiltonian eigensolutions may be provided by selecting K basis states from an ansatz space of a chemical system, wherein the ansatz space is generated by a quantum computer system and includes fewer basis states than a whole basis space for the chemical system, wherein the K basis states are selected according to a selection protocol to define a core space for the chemical system; computing, via an eigensolver provided by a classical computer system, an eigensolution for the chemical system from the core space; and outputting the eigensolution for the chemical system.

Abstract: Calculation control for hybrid computing of Hamiltonian eigensolutions may be provided by selecting K basis states from an ansatz space of a chemical system, wherein the ansatz space is generated by a quantum computer system and includes fewer basis states than a whole basis space for the chemical system, wherein the K basis states are selected according to a selection protocol to define a core space for the chemical system; computing, via an eigensolver provided by a classical computer system, an eigensolution for the chemical system from the core space; and outputting the eigensolution for the chemical system.