Superconducting Coplanar Waveguide Compensation for Air Bridge Loss
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Solution Overview
Problem
The introduction of air bridges in superconducting quantum computing chips increases energy loss, reducing the internal quality factor (Qi) of coplanar waveguides, and existing solutions have not effectively addressed dielectric loss to improve performance.
Innovation Solution
A packaging structure with a coplanar waveguide and an air bridge, where a compensation structure is integrated on the substrate, coplanar waveguide, or air bridge to reduce electromagnetic loss by creating a local electromagnetic field that mitigates energy loss from the air bridge surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air bridges are introduced to connect ground wires, then 3D integration and signal crosstalk suppression are improved, but energy loss increases and internal quality factor decreases
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by introducing a compensation structure that converts the harmful dielectric loss into a beneficial effect. The compensation structure generates a local electromagnetic field that counteracts the energy loss caused by the air bridge, effectively transforming the harmful dielectric loss into a useful compensation mechanism that restores the internal quality factor.
Solution Approach 2:
The patent applies the 'Local quality' principle by creating a localized compensation structure with specific electromagnetic properties at the air bridge location. The compensation structure has tailored dimensions and material characteristics that generate a localized electromagnetic field precisely where needed to counteract the dielectric loss, rather than uniformly modifying the entire structure.
2Ease of manufacture
If photoresist hot-melt method is used to process air bridge, then ground wires are connected, but dielectric layer remains on air bridge surface causing high dielectric loss
Solution Approach 1:
The patent applies the 'Taking out' principle by extracting and removing the harmful dielectric layer from the air bridge surface through optimization of the photoresist removal process. The manufacturing method is refined to completely eliminate residual dielectric material that would otherwise cause energy loss, while maintaining the ease of manufacture benefits of the photoresist hot-melt method.
Solution Approach 2:
The patent applies the 'Parameter changes' principle by optimizing the photoresist removal process parameters (temperature, time, chemical composition) to achieve complete removal of the dielectric layer. By adjusting these process parameters, the method transforms the incomplete removal issue into a controlled process that eliminates dielectric residue while maintaining manufacturing simplicity.
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 compensation structure effectively reduces energy loss and enhances the internal quality factor of the coplanar waveguide, improving the overall performance of the packaging structure.
Implementation Method 1
a compensation structure located on a surface of the substrate... to reduce electromagnetic loss by creating a local electromagnetic field that mitigates energy loss from the air bridge surface
Data Source
AI summary
A waveguide includes: a substrate; a first ground wire; a second ground wire; a signal wire; and a compensation structure. The first ground wire, the second ground wire, and the signal wire are disposed on the substrate at intervals, and the signal wire is located between the first ground wire and the second ground wire. The compensation structure is configured to contact at least one of the substrate, the first ground wire, the second ground wire, or the signal wire; and the compensation structure comprises a superconducting material.