Quantum Dot Gates with Magnetic Materials for Frequency Targeting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current approaches for integrating magnetic fields in quantum dot devices for quantum computing are not scalable for large-scale integration, leading to challenges in controlling magnetic fields and minimizing decoherence due to charge noise.

Innovation Solution

The integration of magnetic materials like cobalt, nickel, or magnetic alloys in the gates of quantum dot devices to provide a gradient magnetic field, allowing for improved control over magnetic fields and their gradients, and enhancing frequency targeting of individual qubits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If magnetic fields are integrated in quantum dot devices using conventional approaches, then magnetic field control is achieved, but scalability for large-scale integration deteriorates

Engineering Contradiction:

Improvemagnetic field controlVSAvoidscalability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent combines magnetic field generation and electrical gating functions into a single integrated gate structure. The gate electrode serves dual purposes: applying electrical potentials to confine electrons and generating magnetic fields through current flow, eliminating the need for separate magnetic field sources and enabling scalable integration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The gate structures in the quantum dot device perform multiple functions simultaneously: they act as electrical gates for electron confinement, as magnetic field sources through current flow, and as part of the quantum dot formation structure. This multi-functionality reduces device complexity and improves scalability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If magnetic fields are integrated in quantum dot devices, then frequency targeting of individual qubits is improved, but charge noise-induced decoherence worsens

Engineering Contradiction:

Improvefrequency targetingVSAvoiddecoherence

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies different magnetic field strengths to different regions of the quantum dot device by varying the current through individual gates. This local differentiation enables precise frequency targeting of specific qubits while maintaining spatial control over the magnetic field distribution to minimize noise exposure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The magnetic field strength is dynamically controlled by adjusting the current through the gate electrodes. This dynamic control allows the system to optimize the balance between achieving sufficient frequency splitting for qubit addressing and minimizing the magnetic field strength to reduce charge noise and decoherence.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If conventional magnetic field integration is used, then device structure is simple, but control over magnetic field gradients deteriorates

Engineering Contradiction:

ImprovestructureVSAvoidmagnetic field gradient control

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent divides the magnetic field generation into multiple independent gate segments, each capable of carrying current to produce local magnetic fields. By independently controlling the current through each gate segment, precise magnetic field gradients can be achieved across different regions of the quantum dot array.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the current distribution across multiple gates to create controlled magnetic field gradients. By varying the current magnitude and direction in different gates, the device can generate tailored magnetic field profiles with precise spatial gradients while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #15Dynamics

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 enables better frequency targeting of individual qubits, minimizes adverse effects of charge noise on qubit decoherence, and provides good scalability in the number of quantum dots included in the device.

Implementation Method 1

The integration of magnetic materials like cobalt, nickel, or magnetic alloys in the gates of quantum dot devices to provide a gradient magnetic field

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS12342733B1Quantum dot devices with magnetic gates

Publication Date: 2025.06.24 INTEL CORP

AI summary

An array of spin qubits relies on a gradient magnetic field to ensure that the qubits are separated in frequency in order to be individually addressable. Furthermore, a strong magnetic field gradient is required to electrically drive the EDSR of the qubits. Quantum dot devices and related methods and systems that integrate magnetic materials in the gates to provide a gradient magnetic field are disclosed. Magnetic materials in different gates may be of different heights to improve frequency separation of neighboring qubits. Unlike previous approaches to quantum dot formation and manipulation, various embodiments of the quantum dot devices disclosed herein may enable improved control over magnetic fields and their gradients to realize better frequency targeting of individual qubits, help minimize adverse effects of charge noise on qubit decoherence and provide good scalability in the number of quantum dots included in the device.