Ion-Implanted Nanorod Suspension for Majorana Coherence

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Solution Overview

Problem

Existing quantum computing technologies face challenges in fabricating robust Majorana fermion devices due to the delicate nature of Majorana fermions, including the difficulty in creating high-quality interfaces, damage from conventional processing methods, and integration of nanorods with superconductors, which affects coherence and functionality.

Innovation Solution

A method for fabricating a suspended Majorana fermion device using ion implant defined nanorods, which involves forming an ion implanted region coupled to a Majorana fermion device, encapsulated by an encapsulation film and substrate layer, and incorporating superconducting layers with oxidation-free interfaces to prevent damage and enhance coherence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional processing methods are used to fabricate Majorana fermion devices, then device structure can be formed, but the delicate Majorana fermions are damaged and coherence is reduced

Engineering Contradiction:

ImprovecoherenceVSAvoidprocessing damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs ion implantation performed in a vacuum environment to define nanorod structures. This inert processing atmosphere prevents oxidation and contamination of the nanorod-superconductor interfaces, thereby preserving Majorana fermion coherence while still enabling precise structural formation.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent replaces conventional mechanical contact-based fabrication methods with ion implantation, a beam-based technique that defines nanorod patterns without physical contact. This substitution eliminates mechanical damage to the delicate nanorod structures and superconductor interfaces, maintaining coherence while achieving precise patterning.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If ion implantation is used to define nanorods, then nanorod precision and interface quality are improved, but additional processing steps are required

Engineering Contradiction:

Improvenanorod definitionVSAvoidfabrication process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple functions into the ion implantation process: it simultaneously defines the nanorod patterns, creates doping regions, and establishes precise interfaces with superconductors. This merging of patterning and material modification functions achieves high manufacturing precision while managing process complexity through multi-functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ion implantation technique serves multiple purposes in the fabrication process: pattern definition, doping, and interface engineering. This universal approach consolidates several fabrication steps into one process, improving nanorod definition precision while offsetting the added complexity through process integration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If nanorods are integrated with superconductors, then Majorana fermion functionality is achieved, but interface quality is difficult to maintain

Engineering Contradiction:

ImproveMajorana functionalityVSAvoidinterface quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent performs ion implantation to define nanorod structures and prepare interfaces before superconductor deposition. This preliminary structuring ensures precise nanorod geometry and clean interfaces are established in advance, enabling high-quality Majorana fermion functionality when superconductors are subsequently integrated.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The ion-implanted nanorod structures serve as intermediaries between the substrate and superconductor layers. These precisely defined nanorods with controlled doping profiles facilitate clean, well-defined interfaces that enable robust Majorana fermion functionality while maintaining manufacturing precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution enables the creation of a robust Majorana fermion device with improved coherence times and potential for fast, universal quantum computing by avoiding damage from conventional processing methods and maintaining the integrity of the ion implant defined nanorods.

Implementation Method 1

Ion implant defined nanorod in a suspended Majorana fermion device

Methodology Applied

Scientific EffectIon implantation: Ion Implantation

Data Source

PatentEP4022684B1Ion implant defined nanorod in a suspended majorana fermion device

Publication Date: 2025.07.23 INTERNATIONAL BUSINESS MACHINE CORPORATION

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AI summary

Devices, systems, methods, computer-implemented methods, apparatus, and/or computer program products that can facilitate a suspended Majorana fermion device (2206) comprising an ion implant defined nanorod (406) in a semiconducting device are provided. According to an embodiment, a quantum computing device can comprise a Majorana fermion device coupled to an ion implanted region (404). The quantum computing device can further comprise an encapsulation film (1404) coupled to the ion implanted region and a substrate layer. The encapsulation film suspends the Majorana fermion device in the quantum computing device.