Voltage-Controlled Ferromagnetic Qubit Tuning Without High Currents
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Solution Overview
Problem
Conventional tunable qubits in quantum computers require high control currents for frequency tuning, leading to issues like heat generation, noise, and crosstalk, and necessitate separate cryogenic electronic devices.
Innovation Solution
A frequency-tunable device using a superconducting qubit with a ferromagnetic material structure, where voltage control adjusts the saturation magnetization to change magnetic flux and resonant frequency, eliminating the need for high control currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high control currents are used for frequency tuning in conventional tunable qubits, then frequency tuning capability is achieved, but heat generation, noise, and crosstalk increase
Solution Approach 1:
The patent replaces the conventional current-based control mechanism with a voltage-based control mechanism. By applying voltage to the ferromagnetic material structure, the magnetization state is controlled, which in turn controls the magnetic flux through the Josephson junction and achieves frequency tuning without requiring high control currents, thereby eliminating heat generation, noise, and crosstalk associated with current control
Solution Approach 2:
The patent changes the control parameter from current to voltage. By controlling the voltage applied to the ferromagnetic material, the magnetization M is controlled, which changes the magnetic flux Φ through the Josephson junction. This parameter change enables frequency tuning while avoiding the harmful effects of high control currents
2Ease of operation
If separate cryogenic electronic devices are used for frequency control, then frequency control functionality is achieved, but device complexity increases
Solution Approach 1:
The patent merges the frequency control functionality directly into the qubit structure by integrating a ferromagnetic material structure with the Josephson junction. The ferromagnetic material is positioned adjacent to the Josephson junction so that its magnetization directly influences the magnetic flux through the junction, enabling frequency control to be achieved through voltage control of the ferromagnetic material without requiring separate external control devices
Solution Approach 2:
The ferromagnetic material structure serves multiple functions: it provides magnetic flux control for frequency tuning, acts as a voltage-controlled element, and integrates directly with the qubit structure. This multi-functionality eliminates the need for separate cryogenic electronic devices, simplifying the overall system
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
This approach reduces heat generation, noise, and crosstalk, enabling stable and efficient resonant frequency control without requiring separate cryogenic devices.
Implementation Method 1
a structure (220) including a ferromagnetic material... the ferromagnetic material providing a magnetic field
Implementation Method 2
changing a magnetic flux of the magnetic field where it passes through the frequency-tunable device
Implementation Method 3
a Josephson junction connecting the first conductive pad to the second conductive pad... a Josephson junction connecting the first conductive pad to the second conductive pad
Implementation Method 4
The first conductive pad and the second conductive pad may be formed of a superconducting material... a superconducting qubit
Implementation Method 5
applying voltage to the structure to change the saturation magnetization of the ferromagnetic material
Data Source
AI summary
Provided are a frequency-tunable device using a magnetic field of a ferromagnetic material, and a superconducting device including the same. The superconducting device according to an embodiment may include: a frequency-tunable device including a Josephson, a first conductive pad and a second conductive pad connected with the first conductive pad by the Josephson junction; a structure including a ferromagnetic material; and a control circuit configured to control a resonant frequency of the frequency-tunable device by applying voltage to the structure to change the saturation magnetization of the ferromagnetic material.