Superconductive Passive Element Structure for High Resonance Q
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Solution Overview
Problem
Conventional superconductive passive elements, such as MKIDs and superconducting quantum bits, face challenges in achieving resonance Q-values that match the potential of bulk superconductors, with current values limited to around several hundred thousand, and require complex cooling methods like dilution refrigerators due to dielectric and substrate interactions.
Innovation Solution
The structure of superconductive passive elements is redesigned to minimize dielectric loss by arranging superconductor parts with their outermost surfaces facing each other, separated by a gap, reducing the impact of substrate effects and enhancing the intrinsic superconducting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional superconductive passive elements use substrate-based transmission line structures (MSL or CPW), then the elements can be manufactured with standard techniques, but the resonance Q-value is limited to around several hundred thousand due to dielectric loss and substrate effects
Solution Approach 1:
The patent extracts the superconductor from the conventional substrate-based transmission line structure (MSL or CPW) and forms it as a free-standing meander-shaped element. This removes the dielectric loss and substrate effects that limit the resonance Q-value, achieving Q-values of 10^6 or higher while maintaining manufacturability through standard thin-film deposition techniques on a substrate that is subsequently removed or suspended
Solution Approach 2:
The patent transitions from planar transmission line structures to a three-dimensional meander-shaped superconductor configuration. This dimensional change allows the superconductor to achieve higher resonance Q-values by eliminating dielectric loss while maintaining a compact form factor that can be manufactured using standard thin-film techniques
2Reliability
If dilution refrigerators are used to cool superconductive elements to achieve high resonance Q-values, then the resonance Q-value can be maintained, but the device complexity and cooling system requirements increase significantly
Solution Approach 1:
The patent converts the previously harmful dielectric loss and substrate effects into benefits by removing the substrate entirely and using the meander-shaped free-standing structure. This eliminates the need for complex dilution refrigerator cooling systems, allowing operation with simpler cooling mechanisms while maintaining high resonance Q-values of 10^6 or higher
3Reliability
If the superconductor is formed as a free-standing meander shape without substrate support, then dielectric loss is minimized and resonance Q-value increases to 10^6 or higher, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the manufacturing process into distinct stages: forming the meander-shaped superconductor pattern on a temporary substrate, selectively removing the substrate in specific regions to create suspended sections, and maintaining the meander configuration. This segmentation enables the complex free-standing structure to be manufactured using standard thin-film deposition and etching techniques without requiring entirely new manufacturing approaches
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 design achieves significantly higher resonance Q-values, up to 10^8, allowing operation at liquid helium temperatures and enabling practical applications with simpler cooling systems, improving sensitivity and maintaining quantum states for longer durations.
Implementation Method 1
superconductive passive elements include those that use superconducting thin films formed on a substrate in a predetermined transmission line pattern, which are cooled down to allow the superconductor to transition to a superconducting state
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
To reduce the loss of superconductive passive elements, the superconductive passive element 100 of the embodiment of the present disclosure includes a first conductor part 1 having a deposited superconductor and a second conductor part 2 having a superconductor. Here, the first conductor part is separated from the second conductor part, the outermost surface 11 of the superconductor deposited on the first conductor part being opposite the second conductor part. Preferably, the superconductor of the second conductor part is one that has been deposited, and the first conductor part and the second conductor part are arranged with their respective outermost surfaces 11, 21 facing each other and separated from each, as in the superconductive passive element 100A. In the embodiment of the present disclosure, a method for manufacturing the above superconductive passive element is also provided.