Superconducting Qubit Frequency Control via Magnetic Domain Walls
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Solution Overview
Problem
Superconducting qubits are susceptible to magnetic flux noise, affecting the stability and control of their resonance frequency due to magnetic field interference.
Innovation Solution
A superconducting qubit-based device incorporating a ferromagnetic body with a magnetic domain wall, controlled by a conducting wire and control circuit to generate a magnetic field greater than a critical value, moves the domain wall to stabilize the resonance frequency through a Josephson junction with conductive pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a magnetic field is used to control the resonance frequency of a superconducting qubit, then the resonance frequency can be tuned, but the qubit becomes susceptible to magnetic flux noise
Solution Approach 1:
The patent introduces a ferromagnetic body as an intermediary between the control mechanism and the superconducting qubit. This ferromagnetic body converts electrical current control into magnetic field control, allowing frequency tuning while isolating the qubit from direct magnetic flux noise. The ferromagnetic material acts as a mediator that transforms the control signal while protecting the sensitive superconducting element.
Solution Approach 2:
The patent replaces direct magnetic field control (which causes flux noise) with electrical current control through a ferromagnetic body. By substituting the direct magnetic actuation with an electrical control mechanism that generates magnetic fields only when needed, the system achieves frequency control while minimizing continuous magnetic flux exposure to the qubit.
2Measurement precision
If continuous current is applied to control the magnetic domain wall position, then precise frequency control is achieved, but energy consumption increases
Solution Approach 1:
The patent employs periodic or pulsed current application to the ferromagnetic body rather than continuous current. The magnetic domain wall is moved to the desired position using controlled current pulses, and once positioned, the domain wall maintains its position without requiring continuous current. This periodic action achieves precise frequency control while dramatically reducing energy consumption compared to continuous actuation.
Solution Approach 2:
The system performs preliminary action by moving the magnetic domain wall to the required position before the actual qubit operation begins. The domain wall is positioned in advance using current pulses, and then remains stationary during the qubit's operational phase, eliminating the need for continuous current during the critical measurement or computation period.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Stabilizes the resonance frequency of superconducting qubits by controlling magnetic domain walls, reducing susceptibility to magnetic flux noise and enabling precise frequency control without continuous current application.
Implementation Method 1
a ferromagnetic body configured to form a Josephson junction with the first conductive pad and the second conductive pad
Implementation Method 2
a control circuit configured to move the magnetic domain wall by controlling the current flowing through the conducting wire to produce a magnetic field greater than or equal to a predetermined critical value
Implementation Method 3
a superconducting qubit comprising a first conductive pad and a second conductive pad, each being formed of a superconducting material
Data Source
AI summary
A superconducting qubit-based device includes: a superconducting qubit comprising a first conductive pad and a second conductive pad, each being formed of a superconducting material, and a ferromagnetic body configured to form a Josephson junction with the first conductive pad and the second conductive pad; a conducting wire spaced apart from the ferromagnetic body by a predetermined distance; and a control circuit configured to control a resonance frequency of the superconducting qubit by controlling a current flowing through the conducting wire.