Superconducting Shield for Quantum IC Magnetic Isolation

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Solution Overview

Problem

The scalability of quantum processors is limited by the complexity of qubit parameter control systems, and superconducting quantum processing integrated circuits face challenges in attenuating unwanted cross-talk between devices, which can negatively impact quantum information processing.

Innovation Solution

Incorporating a superconducting shield in integrated circuits for quantum computing to limit magnetic field interactions between devices, while using dielectric layers to separate metal layers and manage magnetic field interference, thereby promoting quantum effects and controlling device interactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If superconducting shields are added to limit magnetic field interactions, then magnetic interference noise is reduced, but device complexity increases

Engineering Contradiction:

Improvemagnetic interference noiseVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent divides the integrated circuit into multiple layers (first metal layer, second metal layer) separated by dielectric layers, with superconducting shields strategically positioned between layers. This segmentation allows magnetic field isolation without requiring complete shielding of the entire circuit, reducing the overall complexity burden while effectively limiting magnetic interference between specific device regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The superconducting shields are applied locally between specific metal layers rather than uniformly across the entire circuit. The first dielectric layer with first permittivity and second dielectric layer with second permittivity are positioned specifically where magnetic field management is needed, providing targeted magnetic interference reduction only in critical regions where quantum devices require isolation.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If dielectric layers are used to separate metal layers, then magnetic field interactions are controlled, but manufacturing complexity increases

Engineering Contradiction:

Improvemagnetic field interactionsVSAvoidease of manufacture

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent utilizes dielectric layers with different permittivity values (first permittivity and second permittivity) to control magnetic field interactions. By selecting dielectric materials with specific permittivity parameters, the design achieves effective magnetic field management while maintaining compatibility with standard semiconductor manufacturing processes, as permittivity is a material parameter that can be selected during material choice rather than requiring complex post-fabrication adjustments.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If superconducting shields are implemented, then quantum device isolation is improved, but device complexity increases

Engineering Contradiction:

Improvequantum device isolationVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The superconducting shields act as intermediary elements between quantum devices in different metal layers. These shields provide magnetic field isolation and prevent unwanted coupling between devices, thereby improving quantum device reliability and isolation. The shields serve as a mediating structure that enables controlled interaction where needed while blocking interference where not needed.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent addresses quantum device isolation by adding vertical separation through dielectric layers between metal layers, rather than only relying on lateral spacing within the same plane. This dimensional approach (moving from 2D planar spacing to 3D layered separation) provides effective isolation while maintaining compact device footprints, as the shields operate in the vertical dimension to reduce magnetic interference.

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 solution effectively reduces magnetic interference noise and allows for controllable coupling of quantum devices, enhancing the scalability and stability of quantum information processing by isolating devices and localizing magnetic fields, thus supporting coherent quantum information exchange.

Implementation Method 1

a superconducting shield in a shielded region of the integrated circuit so as to limit magnetic field interactions in the shielded region between at least two devices located in the shielded region

Methodology Applied

Scientific EffectMeissner effect: Meissner Effect