Quantum Stripline Layout for Cryogenic Low-Crosstalk Connections
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Solution Overview
Problem
Current striplines are not suitable for quantum computing applications due to limited frequency range, poor thermal conductivity, unsuitable for cryogenic temperatures, and high microwave crosstalk, which restricts the density of qubits and components on a chip.
Innovation Solution
A quantum stripline (q-stripline) is developed using polyimide films with center conductors and elastic pins for electrical and thermal contact, designed to achieve above-threshold thermalization and electrical conductivity at cryogenic temperatures, with crosstalk reduced to less than -50 decibels, enabling high-density connections without soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional striplines are used for electrical connections, then electrical connectivity is achieved, but microwave crosstalk exceeds -50 dB and thermalization is insufficient at cryogenic temperatures
Solution Approach 1:
The patent changes the dielectric parameter (thickness) to at least half of the specified insulator thickness B, and configures the separation distance between center conductors as a function of their dimensions, thereby reducing microwave crosstalk to below -50 dB while maintaining proper thermalization at cryogenic temperatures
Solution Approach 2:
The patent uses polyimide films as the dielectric material, which provides both electrical insulation and adequate thermal conductivity at cryogenic temperatures, creating a composite structure that simultaneously addresses crosstalk reduction and thermalization requirements
2Productivity
If center conductors are placed closer together to increase connection density, then qubit density increases, but microwave crosstalk between conductors increases
Solution Approach 1:
The patent defines the separation distance between center conductors as a specific function of their dimensions, allowing optimal spacing that maximizes connection density while maintaining crosstalk below -50 dB threshold
Solution Approach 2:
The patent increases the dielectric thickness in the vertical dimension, which provides additional separation between conductors in the horizontal plane, thereby reducing crosstalk while allowing conductors to be placed closer together for higher density
3Volume of moving object
If thinner dielectric layers are used to reduce stripline size, then device footprint decreases, but microwave crosstalk between conductors increases
Solution Approach 1:
The patent compensates for reduced horizontal separation by increasing the vertical dimension (dielectric thickness to at least half of B), thereby maintaining adequate electrical isolation and reducing crosstalk while keeping the overall device footprint compact
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 q-stripline provides effective thermalization and electrical conductivity at cryogenic temperatures, reducing crosstalk and enabling higher qubit density on a chip, suitable for quantum computing environments.
Implementation Method 1
an elastic pin configured through a recess in the second polyimide film to make electrical and thermal contact with the first center conductor
Data Source
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AI summary
A stripline that is usable in a quantum application (q-stripline) includes a first polyimide film and a second polyimide film. The q-stripline further includes a first center conductor and a second center conductor formed between the first polyimide film and the second polyimide film. The q-stripline has a first pin configured through a first recess in the second polyimide film to make electrical and thermal contact with the first center conductor.