Quantum Processor Filter with Frequency-Selective Surface
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Solution Overview
Problem
Existing filter arrangements for quantum processors face challenges in achieving high attenuation at frequencies above the operating band while maintaining good in-band performance, particularly due to interference from radiation in the superconducting gap frequency range.
Innovation Solution
A filter arrangement using a waveguiding structure with a frequency-selective surface (FSS) that is electromagnetically reflective for low-frequency bands and transparent for high-frequency bands, guiding electromagnetic waves away from the main path, combined with absorber and shielding arrangements to enhance attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic absorbent material is used to fill transmission lines for high-frequency filtering, then attenuation at high frequencies is improved, but in-band matching and attenuation performance deteriorate
Solution Approach 1:
The filter is divided into distinct functional sections: a first section with electromagnetic absorbent material for high-frequency attenuation, and a second section with resonant structures for stopband filtering. This segmentation allows each section to optimize its specific function without compromising the other, resolving the contradiction between high-frequency attenuation and in-band performance.
Solution Approach 2:
The filter combines two different filtering mechanisms (electromagnetic absorbent material and resonant structures) into a composite filter arrangement. This composite approach leverages the strengths of both methods: the absorbent material provides broadband high-frequency attenuation while the resonant structures provide selective stopband filtering, achieving both high-frequency protection and good in-band performance.
2Reliability
If microwave lowpass filters based on resonant structures are used, then in-band matching and loss performance are improved, but attenuation at high frequencies far from in-band frequencies deteriorates
Solution Approach 1:
The filter is divided into distinct functional sections: a first section with electromagnetic absorbent material for high-frequency attenuation, and a second section with resonant structures for stopband filtering. This segmentation allows each section to optimize its specific function without compromising the other, resolving the contradiction between high-frequency attenuation and in-band performance.
Solution Approach 2:
The filter combines two different filtering mechanisms (electromagnetic absorbent material and resonant structures) into a composite filter arrangement. This composite approach leverages the strengths of both methods: the absorbent material provides broadband high-frequency attenuation while the resonant structures provide selective stopband filtering, achieving both high-frequency protection and good in-band performance.
3Object-affected harmful factors
If electromagnetic absorbent material is used for high-frequency filtering, then high-frequency attenuation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The filter is divided into distinct functional sections: a first section with electromagnetic absorbent material for high-frequency attenuation, and a second section with resonant structures for stopband filtering. This segmentation allows each section to optimize its specific function without compromising the other, resolving the contradiction between high-frequency attenuation and in-band performance.
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 filter arrangement provides improved attenuation of high-frequency radiation, maintaining high isolation and good in-band performance by redirecting high-frequency waves away from the main path, thus protecting quantum processors from harmful interference.
Implementation Method 1
The FSS is arranged to be electromagnetically reflective for a low-frequency band and arranged to be electromagnetically transparent in a direction away from the main waveguiding path at a high-frequency band
Implementation Method 2
The waveguiding structure comprises a frequency-selective surface (FSS) arranged along at least a part of the main waveguiding path
Implementation Method 3
arranged to be electromagnetically transparent in a direction away from the main waveguiding path at a high-frequency band... these high-frequency waves may be terminated in various ways
Data Source
Figure 1A~1B
Figure 2A~3B
Figure 4A~4B
AI summary
A filter arrangement (100) for a quantum processor. The filter arrangement comprises a waveguiding structure (110) arranged to guide electromagnetic waves along a main waveguiding path (111) between a first port (112) and a second port (113). The waveguiding structure (110) comprises a frequency-selective surface, FSS, (120) arranged along at least a part of the main waveguiding path (111). The FSS is arranged to be electromagnetically reflective for a low-frequency band and arranged to be electromagnetically transparent in a direction away from the main waveguiding path (111) at a high-frequency band.