Abstract: A classical computer includes a classical processor and a classical memory coupled to the classical processor. The classical memory includes a gate-graph conversion array, which itself includes at least one correspondence between a conversion quantum gate and a conversion graphical representation. The classical memory further includes classical programming in the classical memory. Execution of the classical programming configures the classical computer to perform the following functions. Receive a plurality of quantum circuit input files, where each quantum circuit input file includes a quantum circuit comprising an input quantum gate. Convert each quantum circuit into a tensor graph by utilizing the gate-graph conversion array. Evaluate the tensor graph as a contraction tree.