Speaker
Description
We propose a hybrid classical–quantum protocol for zero-temperature dynamical correlation functions and excitation spectra of interacting molecular systems. A classical ansatz (MPS or NQS) prepares an approximate ground state; after applying a probe operator, we sample configurations from the perturbed state. Short-time, shallow-circuit evolutions on quantum hardware identify small, dynamically relevant subspaces; projecting the Hamiltonian onto these subspaces enables accurate long-time classical propagation and high-resolution spectra without ground-state preparation on hardware. To tackle sharply peaked wavefunctions in ab-initio quantum chemistry, we introduce an adaptive sampling scheme for NQS that stabilizes and accelerates the variational optimization underlying the classical ground-state preparation.
