Fig. 3: Qubit ADAPT-VQE convergence of energy with respect to the number of parameters and the circuit depth for H4 molecule. | Communications Physics

Fig. 3: Qubit ADAPT-VQE convergence of energy with respect to the number of parameters and the circuit depth for H4 molecule.

From: Variational quantum eigensolver techniques for simulating carbon monoxide oxidation

Fig. 3

The results are provided at molecular radius R equal 2.0 angstrom (Å). ΔE is the energy difference with the exact ground state energy in Hartree. MCP-11 is the minimal complete pool acting in the original qubit space of 8 qubits suggested in Ref. 29. `MCP-11, tapered' is built from MCP-11 by applying tapering procedure. Greedy-10 pool is a qubit linear complete pool constructed using the computational scheme proposed in this work and acts in a 5-qubit space.

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