Cryogenic Filter Modules Using Layered Absorptive Materials
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Solution Overview
Problem
Scalable quantum computing architectures face challenges in designing filters that effectively minimize signal degradation due to self-resonances in reactive components, particularly at specific frequencies, which are difficult to achieve with absorptive materials that have their own characteristic roll-offs.
Innovation Solution
A circuit board with multiple layers of different absorptive materials is used, where signal lines traverse through various layers to achieve low pass filtering, and additional filtering and attenuation can be provided by fabricated chips, allowing for tailored filtering responses by selecting materials and traversal lengths based on desired frequency responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If absorptive materials are used for filtering, then signal filtering is achieved, but self-resonances cause breakdown at specific frequencies
Solution Approach 1:
The filter is divided into multiple discrete stages, each comprising absorptive material sections and reactive component sections arranged in sequence. This segmentation allows each stage to handle specific frequency ranges independently, preventing self-resonance breakdown across the entire filtering band by distributing the filtering function across multiple controlled segments.
Solution Approach 2:
Different sections of the filter employ different material properties and configurations - absorptive materials in certain sections for broadband attenuation, reactive components in other sections for frequency-selective filtering. This local differentiation optimizes each section's performance for its specific function while mitigating the self-resonance issue through strategic placement and design of each local segment.
2Measurement precision
If reactive components are used for filtering, then frequency selectivity is improved, but self-resonances cause breakdown at specific frequencies
Solution Approach 1:
Absorptive materials are introduced as intermediary elements between reactive components or in conjunction with them. These absorptive sections act as mediators that provide broadband attenuation and damping, suppressing self-resonances and stabilizing the frequency response while allowing the reactive components to maintain their frequency-selective function without breakdown.
3Adaptability or versatility
If multiple absorptive materials are used, then filtering coverage is improved, but device complexity increases
Solution Approach 1:
The filter structure employs a standardized multi-stage configuration where each stage combines absorptive and reactive elements in a universal pattern. This modular design allows the same basic structure to achieve broad filtering coverage across different frequency ranges by adjusting material properties and dimensions, rather than designing entirely different complex structures for each application.
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 enables effective low pass filtering at frequencies where reactive components break down due to self-resonances, improving signal coherence and reducing degradation in quantum computing systems by allowing for specific filtering and attenuation functions.
Implementation Method 1
various ones of the plurality of layers comprises a different absorptive material... a first layer of the circuit board is comprised of a first material that filters a first signal line
Data Source
AI summary
One or more systems, devices, and/or methods of use provided herein relate to signal filters for scalable quantum computing architectures. According to one embodiment, a device can comprise a circuit board comprising a plurality of layers, wherein various ones of the plurality of layers comprises a different absorptive material, and a plurality of signal lines that pass through the circuit board, wherein a first layer of the circuit board is comprised of a first material that filters a first signal line that traverses through at least the first layer of the plurality of layers.