Cryostat Joint Shielding With Waveguide Flanges for EMI Control

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Solution Overview

Problem

Existing quantum computing systems face challenges in maintaining amplitude stability and reducing noise and interference from electromagnetic interference, particularly in low latency and high sensitivity environments.

Innovation Solution

A cryostat enclosure is constructed with waveguide flanges and shield flanges joined at joints, forming waveguide channels and shield surfaces to attenuate electromagnetic signals, using specific configurations to manage target frequencies and enhance shielding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional shielding structures are used in quantum computing systems, then electromagnetic interference is reduced, but signal loss and amplitude instability increase due to joint gaps and imperfect sealing

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidsignal fidelity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The shielding structure is divided into multiple modular sections that can be assembled together, with each section containing integrated waveguide channels. This segmentation allows for precise manufacturing of individual components while maintaining overall shielding effectiveness through specialized joint designs that prevent electromagnetic leakage at interfaces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Waveguide channels are nested within the shielding structure, with attenuation channels positioned concentrically around the waveguide channels. This nested configuration allows the attenuation channels to surround and protect the waveguide channels while maintaining a compact overall structure that prevents electromagnetic interference without compromising signal integrity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Measurement precision

If tighter error margins are implemented for high sensitivity quantum computing, then computation accuracy improves, but noise mitigation becomes more challenging

Engineering Contradiction:

Improvecomputation accuracyVSAvoidnoise

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Different regions of the shielding structure have specialized configurations optimized for their specific functions: waveguide channels are positioned and dimensioned to transmit microwave control signals with minimal loss, while attenuation channels are configured with specific geometries to absorb and dissipate electromagnetic noise at targeted frequencies, creating locally optimized zones for signal preservation and interference rejection.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The structure converts potentially harmful electromagnetic interference into beneficial attenuation through the attenuation channels, which are designed to absorb and dissipate noise energies. The waveguide channel configuration also converts the need for signal transmission into an opportunity for controlled signal propagation with enhanced stability by using precise geometric configurations that minimize reflections and standing waves.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If waveguide channels are configured proportionally to predetermined frequencies, then signal transmission at target frequencies is optimized, but shielding effectiveness at other frequencies may be compromised

Engineering Contradiction:

Improvesignal transmissionVSAvoidbroadband electromagnetic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The shielding structure employs multiple waveguide channels with different proportional configurations, each optimized for specific frequency ranges. This dynamic configuration allows the system to handle multiple frequency bands simultaneously, with each channel acting as a frequency-selective pathway that maintains signal integrity for its designated frequency range while the collective arrangement provides broad-spectrum shielding effectiveness.

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

The enclosure effectively reduces electromagnetic interference, improving signal fidelity and reducing error rates in quantum computing systems by enhancing the reliability of qubit manipulation and computation accuracy.

Implementation Method 1

Each joint includes a waveguide flange at one end of one of the sections. The waveguide flange defines a waveguide channel that is configured proportionally to a predetermined electromagnetic frequency. Each joint also includes a shield flange at one end of another section joined to the waveguide flange. The shield flange defines a shield surface for the waveguide channel.

Methodology Applied

Scientific EffectElectromagnetic reflection and absorption: Reflection

Data Source

PatentUS20250372854A1Cryostat with electromagnetic shielding

Publication Date: 2025.12.04 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

An enclosure is constructed of multiple sections joined end-to-end at joints. Each joint includes a waveguide flange at one end of one of the sections. The waveguide flange defines a waveguide channel that is configured proportionally to a predetermined electromagnetic frequency. Each joint also includes a shield flange at one end of another section joined to the waveguide flange. The shield flange defines a shield surface for the waveguide channel.