Quantum Chip Electrode Patterning for Uniform Wire Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for wire bonding in quantum chips face challenges with adhesion issues, leading to fluctuations in wire density and surface deterioration during manual bonding processes, especially when using superconductors like niobium, which are difficult to bond with conventional wires.
Innovation Solution
A quantum chip design featuring a substrate with a superconducting layer and an electrode having a periodic structure along its edge, which serves as a marking for bonding wires, improving workability and reducing fluctuations in wire density by providing a reference for both manual and automatic bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wire bonding is performed manually on quantum chips with superconducting layers, then flexibility in handling complex bonding patterns is improved, but adhesion reliability deteriorates due to poor wire adhesion to superconductors like niobium
Solution Approach 1:
The patent introduces an intermediary material layer between the wire and the superconducting layer to facilitate adhesion. This intermediate layer acts as a mediator that enables reliable bonding between the wire and the superconductor, solving the adhesion problem while maintaining the ability to perform complex bonding patterns manually.
Solution Approach 2:
The patent modifies the surface properties of the superconducting layer by changing parameters such as surface roughness, oxidation state, or chemical composition to improve wire adhesion. These parameter changes enable better bonding without compromising the superconducting properties, allowing manual wire bonding to proceed with improved reliability.
2Ease of operation
If simple markings are provided on the quantum chip for wire bonding guidance, then workability of wire bonding is improved, but fluctuation in wire density cannot be eliminated
Solution Approach 1:
The patent pre-establishes a periodic structure on the quantum chip surface before wire bonding. This periodic structure serves as a pre-defined guide that automatically determines wire placement positions, eliminating the need for operators to make decisions during bonding and thereby reducing fluctuations in wire density while maintaining improved workability.
Solution Approach 2:
The periodic structure on the quantum chip serves itself as a bonding guide, automatically providing positional information for wire placement. This self-service mechanism eliminates reliance on operator judgment and ensures consistent wire density without requiring complex external guidance systems.
3Reliability
If Al pad electrode is deposited on superconducting layer to enhance wire adhesion, then adhesion of bonding wire is improved, but device complexity increases due to additional material deposition steps
Solution Approach 1:
The patent merges the adhesion enhancement function with the existing superconducting layer structure by integrating the intermediate adhesion layer into the overall device architecture. This merging approach enables improved wire adhesion while minimizing additional complexity by combining multiple functions into a unified structure.
Solution Approach 2:
The patent designs the intermediate layer or modified superconducting surface to serve multiple functions: maintaining superconducting properties, providing wire adhesion, and potentially serving as part of the electrical connection path. This multi-functionality reduces the need for separate dedicated adhesion layers, thereby improving adhesion without proportionally increasing device complexity.
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 periodic structure on the quantum chip's electrode enhances the adhesion and uniformity of bonding wires, reducing the likelihood of surface damage and improving the efficiency of the wire bonding process, even in cryogenic environments.
Implementation Method 1
a superconducting layer formed on a surface of the substrate
Data Source
AI summary
Provided is a quantum chip that includes a substrate, a superconducting layer formed on a surface of the substrate, an electrode formed on a surface of the superconducting layer along an outer edge of the substrate, and a periodic structure formed on a surface of the superconducting layer along an outer edge of the substrate.