Hybrid VQE-CVQE algorithm using diabatic state preparation
This hybrid algorithm uses diabatic state preparation to create a guiding quantum state, which is then optimized via Cascaded Variational Quantum Eigensolver (CVQE). It calculates ground-state energies by projecting the full Hamiltonian onto a subspace defined by states measured from the guiding state. This method offers effective ground-state energy calculation for both near-term and long-term quantum computers.