System and method for sweeping magnetic FLUX from superconducting integrated circuits

The active steering of trapped flux using localized heating and magnetic gradients in superconducting circuits addresses flux trapping issues, enabling high integration density and reliability without complex shielding or thermal cycling, surpassing conventional methods in reducing magnetic fields.

WO2025207167A2 Publication Date: 2025-10-02SEEQC INC +2
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Patent Information

Application Number
PCT/US2024/060201
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-12-13
Filing Date
2024-12-13
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Flux trapping in superconducting integrated circuits remains a significant impediment to reliable operation and scaling, despite existing mitigation strategies, which are not scalable or effective, often requiring complex magnetic shielding and thermal cycling, and are area-expensive as integration density increases.

Method used

An active steering method using control lines with localized heating and magnetic gradients to sweep trapped magnetic vortices away from active circuit areas, employing thermal and magnetic field sensing for feedback-controlled optimization.

Benefits of technology

Enables high circuit integration density, simplifies magnetic shielding, and enhances reliability and stability without extensive moats or repetitive thermal cycling, achieving a magnetic field reduction beyond conventional methods.

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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.
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