Trench Quantum Dot Structure With Conductive Liners for Precise Confinement

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Solution Overview

Problem

Existing quantum computing technologies face challenges in achieving strong spatial localization and control over quantum dots, scalability, and flexible electrical connections for quantum computing devices.

Innovation Solution

The development of trench-based quantum dot devices with conductive liners, which include a quantum well layer, insulating material with trenches, and gate metals, providing precise confinement and control over quantum dots, enabling good scalability and flexible electrical connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional quantum dot formation methods are used, then quantum dots can be formed, but strong spatial localization and control over quantum dots cannot be achieved

Engineering Contradiction:

Improvespatial localization precisionVSAvoiddevice structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The device structure is segmented into distinct functional regions: quantum well layers for quantum dot formation, insulating material layers for isolation, and gate electrode structures for control. This segmentation enables precise spatial localization of quantum dots within defined regions while maintaining manufacturability through standardized layer fabrication processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different material properties are applied locally to achieve specific functions: high-quality semiconductor materials in quantum well regions for precise quantum dot formation, insulating materials in barrier regions for spatial confinement, and conductive gate materials in control regions. This local differentiation enables strong spatial localization without requiring complex overall device architecture.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If quantum dots are formed with precise confinement, then control over quantum dot interactions is improved, but scalability to larger numbers of quantum dots is limited

Engineering Contradiction:

Improvequantum dot confinement precisionVSAvoidquantum dot fabrication scalability

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The quantum well layer structure serves multiple functions simultaneously: it provides the confined region for quantum dot formation, acts as a template for uniform quantum dot spacing, and enables batch fabrication of multiple quantum dots across the wafer. This multi-functionality allows precise confinement of individual quantum dots while scaling to large arrays through single-step epitaxial growth processes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The quantum well layers and insulating material layers are pre-formed with precise thicknesses and compositions before quantum dot formation. This preliminary structuring creates defined nucleation sites that guide uniform quantum dot formation across the entire device area, enabling scalable fabrication while maintaining precise spatial confinement through the pre-established layer architecture.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If traditional electrical connection methods are used, then device fabrication is simplified, but design flexibility for integrating quantum computing components is reduced

Engineering Contradiction:

Improveelectrical connection design flexibilityVSAvoiddevice structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Electrical connections are implemented in the vertical dimension through stacked quantum well layers and gate electrodes, rather than only in the planar dimension. This vertical stacking enables flexible routing of electrical connections between quantum dot regions without requiring complex lateral interconnect structures, providing design flexibility while maintaining fabrication simplicity through conformal deposition processes.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

The trench-based quantum dot devices offer strong spatial localization, good scalability, and design flexibility for quantum computing devices, enhancing control over quantum dot interactions and integration into larger computing systems.

Implementation Method 1

a conductive material proximate to the opening, between the quantum well layer and the first insulator material

Methodology Applied

Scientific EffectElectrostatic confinement: Electric Field

Data Source

PatentUS12471504B1Trench-based quantum dot devices with conductive liners

Publication Date: 2025.11.11 INTEL CORP

AI summary

Disclosed herein are quantum dot devices with conductive liners, as well as related computing devices and methods. For example, in some embodiments, a quantum dot device may include a first insulator material over the quantum well layer, wherein the first insulator material includes an opening (e.g., a trench); a gate metal on the first insulator material and extending into the opening; a conductive material proximate to the opening, between the quantum well layer and the first insulator material; and a second insulator material between the conductive material and the opening.