System and method for sweeping magnetic flux from superconducting integrated circuits

Abstract

A system and method for eliminating flux trapping in superconducting integrated circuits. An array of control current lines is provided, closely coupled thermally and magnetically with a superconducting integrated circuit. These control lines are configured to produce both heat and magnetic fields, with amplitudes and sequences of control currents designed to sweep magnetic flux away from the superconducting circuits at cryogenic operating temperatures. Verification may be obtained using SQUID magnetic sensors located close to the circuits. Similar methods may be applied to all superconducting integrated circuits which are sensitive to weak magnetic fields, including classical single-flux-quantum circuits, sensor arrays, and quantum computing circuits comprised of superconducting qubits. This system is scalable to superconducting circuits with up to millions of superconducting devices. The control currents may be configured to operate under automated feedback control.

Dependencies are inferred from the claim text.