Superconducting circuit and quantum computer

Abstract

A superconducting circuit and a quantum computer capable of implementing four-body interaction using a plurality of superconducting qubit circuits supplied with signals of the same frequency are provided. A superconducting circuit () includes four superconducting qubit circuits (), a coupling circuit () directly connected to the four superconducting qubit circuits (). Each of the superconducting qubit circuits () indicates a qubit by being in a first phase state or a second phase state, when the number of the superconducting qubit circuits () in the first phase state among the four superconducting qubit circuits () is an even number, an interaction term of Hamiltonian of the superconducting circuit () takes a first value, and when the number of the superconducting qubit circuits () in the first phase state among the four superconducting qubit circuits () is an odd number, the interaction term takes a second value.