1. A computing device configured to determine a quantum Karnaugh map corresponding to a quantum circuit, the computing device comprising: a decomposer configured to decompose a quantum circuit into a plurality of sub-circuits; a first logic unit configured to receive possible inputs of each sub-circuit and determine corresponding outputs of each sub-circuit in response to the received possible inputs to obtain input/output relation of each sub-circuit; a second logic unit configured to construct a sub-quantum Karnaugh map corresponding to each sub-circuit based on the input/output relation of each sub-circuit; and a third logic unit configured to obtain a product of entries in the same position of each sub-quantum Karnaugh map to determine a quantum Karnaugh map corresponding to the quantum circuit.