Grounded Shield Structure for Quantum Chip Noise Isolation

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Solution Overview

Problem

Exogenous noise, such as electromagnetic waves, interferes between the quantum chip and the insulating substrate in quantum devices, causing processing errors in quantum circuits.

Innovation Solution

A quantum device is designed with a shield part surrounding the quantum circuit region of the interposer and quantum chip, formed from metallic materials connected to the ground, to prevent interference from exogenous noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the quantum chip is mounted on the interposer without a shield part, then the device structure is simple and easy to manufacture, but exogenous noise enters between the quantum chip and interposer causing processing errors

Engineering Contradiction:

Improvequantum circuit operation accuracyVSAvoiddevice structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A shield part is introduced as an intermediary component between the quantum chip and interposer. This shield part surrounds the quantum circuit region and is connected to ground, acting as a mediator to block exogenous noise from entering the quantum circuit region, thereby improving operation accuracy while maintaining manageable device complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shield part is designed to preemptively counteract exogenous noise before it can interfere with the quantum circuit. By surrounding the quantum circuit region with grounded shielding structures, the design prevents noise entry in advance, addressing the reliability issue before processing errors occur

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If a shield part is added to surround the quantum circuit region, then processing errors are reduced and quantum coherence quality is improved, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvequantum coherence qualityVSAvoidmanufacturing ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The shield part is designed to provide localized shielding only in the quantum circuit region where noise protection is critical. Rather than shielding the entire device, the shield part is strategically positioned to surround only the necessary area, maintaining manufacturing ease while improving quantum coherence quality through targeted noise protection

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The shield part employs thin-film or shell-like structures that can conform to the quantum chip and interposer interface. This approach provides effective noise shielding while minimizing the added complexity and maintaining ease of manufacturing through the use of flexible, conformal shielding layers

Inventive Principle:

Principle #30Flexible shells and thin films

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 shield effectively reduces processing errors and improves the quality of quantum coherence by shielding the quantum circuit from external noise.

Implementation Method 1

a shield part provided so as to surround a quantum circuit region of the interposer and the quantum chip

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS11798895B2Quantum device including shield part and method of manufacturing the same

Publication Date: 2023.10.24 NEC CORP

AI summary

A quantum device (100) includes an interposer (112), a quantum chip (111) mounted on the interposer (112), and a shield part (150) provided so as to surround a quantum circuit region of the interposer (112) and the quantum chip (111). Accordingly, the quantum device (100) is able to prevent interference in the quantum circuit region due to exogenous noise.