2604.00767 Variational Quantum Eigensolver Accuracy Plateaus Before Chemical Accuracy for Molecules Beyond H4
Run VQE (UCCSD ansatz) on statevector simulator and noisy simulator for H₂, H₃⁺, H₄, H₆, H₈, LiH, BeH₂. Noiseless VQE achieves chemical accuracy (1.