Amorphous Superconducting Alloys for Quantum Circuits
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Solution Overview
Problem
Traditional microstructures for superconducting resonators and qubits suffer from surface roughness and crystallization during anneal processes, leading to increased microwave losses and decreased quality factors.
Innovation Solution
The use of amorphous superconducting alloys with elements that do not form intermetallic compounds and have different crystal structures, atomic sizes, and low miscibility, such as Tantalum-Zirconium, to create smooth surfaces and maintain amorphous states at elevated temperatures, reducing grain boundaries and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional crystalline alloys are used in superconducting circuits, then the material can undergo anneal processes, but surface roughness increases and quality factor decreases
Solution Approach 1:
The patent changes the fundamental structural parameter of the material from crystalline to amorphous phase. This parameter change eliminates grain boundaries and surface roughness issues associated with crystalline structures, while maintaining superconducting properties and anneal capability. The amorphous structure provides a uniform surface that reduces microwave losses and improves quality factor.
Solution Approach 2:
The patent employs composite material design by creating amorphous alloys with specific element combinations (e.g., Ta-Zr, Nb-Hf) that maintain superconductivity while achieving amorphous phase stability. These composite amorphous materials combine the benefits of multiple elements to prevent crystallization during annealing while providing smooth surfaces and high quality factors.
2Ease of manufacture
If standard crystalline alloys are used, then anneal processes can be performed, but crystallization occurs during annealing
Solution Approach 1:
The patent changes the phase state parameter from crystalline to amorphous, which fundamentally alters the material's response to thermal processing. The amorphous phase remains stable during annealing processes that would normally cause crystallization in standard alloys, allowing manufacturers to perform necessary anneal steps without losing the amorphous structure's benefits.
Solution Approach 2:
The patent applies local quality by designing specific alloy compositions (such as Ta-Zr with particular atomic ratios) that create localized atomic arrangements preventing crystallization. This compositional design ensures that the material maintains its amorphous character in the specific regions where it is deposited, even when subjected to elevated temperatures during manufacturing anneals.
3Reliability
If amorphous superconducting alloys are used, then surface smoothness and quality factor improve, but material selection becomes more restrictive
Solution Approach 1:
The patent achieves universality by developing a family of amorphous superconducting alloys with different element combinations (Ta-Zr, Nb-Hf, Mo-Re, etc.) that all exhibit similar beneficial properties. This multi-functional approach allows selection from multiple material systems depending on specific application requirements, maintaining flexibility while ensuring high quality factor performance across different circuit designs.
Solution Approach 2:
The patent utilizes parameter changes by varying the specific element composition ratios within the amorphous alloy system to optimize different properties. By adjusting parameters such as atomic percentages of constituent elements, the material can be tuned for specific applications while maintaining the amorphous phase and smooth surface characteristics, thus preserving adaptability.
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
This approach enhances the quality factors of resonators and qubits by minimizing microwave losses and maintaining surface uniformity, resulting in better performing quantum circuits.
Implementation Method 1
traditional structures do not remain amorphous through anneal processes and, thus, can crystallize during the anneal processes
Implementation Method 2
At least one element of the two or more elements is superconducting
Data Source
AI summary
Techniques facilitating formation of amorphous superconducting alloys for superconducting circuits are provided. A device can comprise one or more superconducting components that comprise an amorphous superconducting alloy comprising two or more elements. At least one element of the two or more elements is a superconducting element.