Quantum Computer Apparatus and Method for Operation

A method for configuring a hybrid computing arrangement to implement a simulation of a chemical system, wherein the hybrid computing arrangement includes a combination of a classical computer coupled to a quantum computer, wherein the hybrid computing arrangement is configured in use to receive input data and to generate corresponding processed output data from the input data, wherein the method includes:

• (a) configuring the classical computer to receive information describing a chemical system in the input data;
• (b) configuring the classical computer to process the information describing the chemical system using a pre-entangler to generate a fixed circuit describing static correlations of a wavefunction that describes the chemical system, and using a quantum ansatz to generate a variational quantum circuit describing dynamic correlations of the wavefunction;
• (c) configuring the quantum computer to execute a quantum circuit corresponding to the fixed circuit and the variational circuit to generate quantum computations results;
• and
• (d) configuring the classical computer to process the quantum computational results to generate the output data including information describing an electron orbital simulation of the chemical system.