Superconducting Flex Circuits With Electroplated Contacts for Quantum Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quantum computing systems face challenges in efficiently transmitting signals between classical and quantum hardware due to increasing complexity, requiring robust and low-noise signal lines that maintain low thermal conductivity and minimize cross-talk, while also scaling with the number of qubits, and interfacing with superconducting materials poses difficulties in forming quality electrical contacts.
Innovation Solution
The development of superconducting flex circuit boards with metal structures electroplated onto superconducting layers, including dielectric and ground layers, to improve signal transmission and interfacing, using materials like niobium and copper, and employing methods like electroplating and adhesion layers to enhance adherence and reduce contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superconducting materials are used in flex circuit boards, then signal transmission quality is improved, but forming quality electrical contacts becomes difficult
Solution Approach 1:
The patent introduces metal structures (such as copper or aluminum) as intermediary elements between external connections and superconducting signal lines. These metal structures serve as mediators that are easier to bond with while maintaining electrical connection to the superconducting material, thus resolving the difficulty of forming quality electrical contacts without compromising signal transmission quality
Solution Approach 2:
The patent employs composite structures combining superconducting materials with normal metal materials in the same circuit board. The superconducting layers provide low-noise signal transmission while the normal metal structures provide easier manufacturability for electrical contacts, creating a hybrid system that leverages the advantages of both material types
2Adaptability or versatility
If more signal lines are added to accommodate increasing qubit complexity, then system capability is improved, but cross-talk between signal lines increases
Solution Approach 1:
The patent applies different material properties to different regions of the circuit board. Superconducting materials are used specifically for signal lines where low noise and low cross-talk are critical, while normal metals are used for power and ground lines. This localized application of superconducting properties reduces cross-talk between adjacent signal lines while maintaining overall system capability
3Temperature
If signal lines are designed to have low thermal conductivity, then quantum hardware cooling is improved, but signal transmission efficiency may be affected
Solution Approach 1:
The patent segments the circuit board into different thermal zones. The portions of signal lines that pass through colder regions near the quantum hardware are made from superconducting materials with low thermal conductivity to minimize heat leakage. In warmer regions farther from the quantum hardware, normal metal materials with higher thermal conductivity are used to maintain signal transmission efficiency, thus resolving the contradiction through spatial segmentation
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 solution provides improved signal transmission characteristics, reduced thermal conductivity, and increased scalability for quantum computing systems, while overcoming challenges in interfacing with superconducting materials, enabling more efficient and reliable operations.
Implementation Method 1
The superconducting material can be superconducting at a temperature less than about 3 kelvin
Implementation Method 2
The flex circuit board can have at least one metal structure electroplated onto the at least one superconducting layer
Data Source
AI summary
A flex circuit board can be used in transmitting signals in a quantum computing system. The flex circuit board can include at least one dielectric layer and at least one superconducting layer disposed on a surface of the at least one dielectric layer. The at least one superconducting layer can include a superconducting material. The superconducting material can be superconducting at a temperature less than about 3 kelvin. The flex circuit board can have at least one metal structure electroplated onto the at least one superconducting layer.