Beaded Bellows Coaxial Waveguide for Low-Loss Qubit Interconnects
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Solution Overview
Problem
Existing waveguides, particularly those used in quantum computing, face challenges with signal loss due to the use of lossy dielectric materials like PTFE, which limits the quality factor (Q) of the cables and affects the performance of qubit-qubit interconnects.
Innovation Solution
A flexible waveguide design featuring a bellows-shaped outer conductor and dielectric members (beads) with a crystalline structure, such as sapphire or silicon, which provides a higher quality factor and reduces signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If lossy dielectric materials like PTFE are used in waveguides, then the waveguide structure is simple and easy to manufacture, but the quality factor decreases and signal loss increases
Solution Approach 1:
The patent removes lossy dielectric materials from the waveguide structure entirely, replacing them with air or vacuum spaces. The hollow or partially hollow conductor design extracts the problematic dielectric material, eliminating the source of signal loss while maintaining structural integrity through the conductor geometry itself.
Solution Approach 2:
The waveguide incorporates hollow or porous conductor structures with internal cavities or channels. These porous-like structures replace solid dielectric materials, allowing electromagnetic fields to propagate through air or vacuum spaces within the conductor, thereby reducing dielectric losses while maintaining mechanical support.
2Reliability
If traditional coaxial cable structures are used for qubit-qubit interconnects, then the cable structure is simple, but the quality factor is limited and affects performance
Solution Approach 1:
The waveguide is divided into distinct sections with different geometries (e.g., transition sections, constant impedance sections, tapered sections). Each segment serves a specific function in maintaining impedance matching or reducing reflections, allowing the overall structure to achieve high reliability through optimized functional zones rather than a simple uniform design.
Solution Approach 2:
The waveguide incorporates variable cross-sectional dimensions along its length, with tapered sections and adjustable geometries that dynamically adapt the impedance profile. This dynamic variation in structure allows for optimized signal transmission and reduced reflections, improving interconnect performance despite increased geometric complexity.
Data Source
AI summary
A flexible coaxial waveguide includes a plurality of dielectric members including a center portion having a hole. An inner conductor having the plurality of dielectric members is arranged through the hole in the center portion, and an outer conductor surrounds the plurality of dielectric members. The outer conductor is a bellows-shaped outer conductor.