Kinetic Inductance Element via Phase Decomposition Annealing
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Solution Overview
Problem
Existing methods for preparing inductance elements with high kinetic inductance are complex and introduce parasitic resonance, reducing the accuracy and reliability of superconducting quantum bits, and have stability issues due to high requirements for preparation devices.
Innovation Solution
A method involving the acquisition and annealing of a compound with a superconducting coherence length shorter than its magnetic field penetration depth to cause spontaneous decomposition between non-superconductor and superconductor phases, generating an inductance element with kinetic inductance greater than geometric inductance, using compounds like aluminum titanium nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple Josephson junctions are connected in series to form an array, then high kinetic inductance is achieved, but parasitic resonance is introduced reducing measurement accuracy
Solution Approach 1:
The patent extracts the harmful parasitic resonance effect by removing the traditional Josephson junction array structure and replaces it with a single-layer superconducting film structure, thereby eliminating the source of measurement errors while maintaining the desired high kinetic inductance property
Solution Approach 2:
The patent uses composite material structure by forming a superconducting film on a substrate, where the superconducting material exhibits both high kinetic inductance and avoids the parasitic resonance issues of Josephson junction arrays, achieving a balance between performance and measurement reliability
2Reliability
If multiple Josephson junctions are connected in series, then high kinetic inductance is achieved, but the preparation process becomes complicated
Solution Approach 1:
The patent merges multiple Josephson junctions into a single continuous superconducting film layer, simplifying the preparation process from assembling many discrete components to depositing one uniform layer, thereby improving preparation stability and reducing process complexity
Solution Approach 2:
The patent segments the superconducting film into different phases (superconducting and non-superconducting regions) within a single layer structure, achieving high kinetic inductance through phase separation rather than through series connection of multiple junctions, thus simplifying the overall preparation process
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 simplifies the preparation of inductance elements, improves measurement accuracy and reliability of quantum bits, and enhances the stability of the preparation process.
Implementation Method 1
annealing the compound to cause decomposition between a non-superconductor phase and a superconductor phase in the compound to generate the inductance element
Implementation Method 2
annealing the compound to cause decomposition between a non-superconductor phase and a superconductor phase in the compound
Implementation Method 3
a superconducting coherence length and a magnetic field penetration depth of the compound meeting a preset condition
Data Source
AI summary
A method and a device for preparing an inductance element, an inductance element, and a superconducting circuit are provided. The method includes acquiring a compound for preparing an inductance element, a superconducting coherence length and a magnetic field penetration depth of the compound meeting a preset condition; and annealing the compound to cause decomposition between a non-superconductor phase and a superconductor phase in the compound to generate the inductance element, the kinetic inductance of the inductance element being greater than the geometric inductance of the inductance element.