Fig. 4: Qubit ADAPT-VQE convergence of energy with respect to the number of parameters and the circuit depth for LiH molecule.
From: Variational quantum eigensolver techniques for simulating carbon monoxide oxidation
The results are provided at molecular radius R equal 3.0 angstrom (Å). ΔE is the energy difference with the exact ground state energy in Hartree. MCP-14 is the minimal complete pool acting in the original qubit space of 10 qubits suggested in previous work29. `MCP-14, tapered' is built from MCP-14 by applying tapering procedure. Greedy-12 pool is a qubit linear complete pool constructed using the computational scheme proposed in this work and acts in a 6-qubit space.
