Cryogenic Quantum Circuit Thermalization via Optimized Substrate Thickness
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Solution Overview
Problem
Current superconducting quantum circuits face challenges with thermal conductance due to material thickness and thermal boundary resistance, leading to inefficient heat transfer and noise propagation, which affects the reliability of quantum computing operations.
Innovation Solution
A method and system for improved thermalization of cryogenic quantum circuits are introduced, involving a substrate with a thickness optimized for energy dissipation, a thermal layer with high cryogenic thermal conductivity, and an intervening material for enhanced heat transfer, using materials like gold, copper, or silver, and techniques such as milling or etching to reduce substrate thickness and increase thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If substrate thickness is increased, then structural strength is improved, but thermal conductance deteriorates
Solution Approach 1:
The patent optimizes the substrate thickness parameter to a specific range (50-200 micrometers) to achieve the optimal balance between structural strength and thermal conductance. This parameter optimization allows the substrate to maintain sufficient mechanical strength while enabling efficient heat transfer from the quantum circuit to the heat sink.
Solution Approach 2:
The patent employs composite material structures including thermal interface materials between the substrate and heat sink, and potentially different substrate materials with optimized thermal and mechanical properties. These composite structures enhance overall thermal conductance while maintaining structural integrity.
2Loss of energy
If thermal layer thickness is increased, then heat transfer capability is improved, but thermal boundary resistance increases
Solution Approach 1:
The patent optimizes the thermal layer thickness to a specific range (10-100 micrometers) to balance heat transfer capability and thermal boundary resistance. This optimized thickness ensures sufficient thermal conduction path while minimizing the negative effects of thermal boundary resistance at interfaces.
Solution Approach 2:
The patent applies different material properties and layer configurations at different locations within the thermal management system. Thermal interface materials with specific properties are applied at critical interfaces to minimize thermal boundary resistance, while the bulk thermal layer provides the primary heat conduction path.
3Loss of energy
If material thickness is reduced to improve thermal conductivity, then thermalization efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific thickness ranges (50-200 micrometers for substrate, 10-100 micrometers for thermal layer) that balance thermalization efficiency with manufacturability. These ranges are optimized to achieve good thermal contact while remaining within the capabilities of standard manufacturing processes.
Solution Approach 2:
The patent introduces thermal interface materials as intermediary layers between the substrate and heat sink. These intermediary materials provide tolerance for thickness variations and manufacturing imperfections, ensuring consistent thermal performance even when precise thickness control is difficult to achieve.
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 solution enhances thermalization processes, reducing thermal noise and improving heat transfer efficiency across the quantum circuit and housing interface, thereby maintaining the integrity of quantum states and enhancing the reliability of quantum computing operations.
Implementation Method 1
a thermal layer, formed on the substrate, of a first material that exhibits at least a threshold level of thermal conductivity
Implementation Method 2
improved thermalization of cryogenic quantum circuits
Data Source
AI summary
In an embodiment, a device includes a substrate having a thickness, wherein the thickness is a function of energy dissipation of a particle. In an embodiment, the device includes a thermal layer, formed on the substrate, of a first material that exhibits at least a threshold level of thermal conductivity, wherein the threshold level of thermal conductivity is achieved at a cryogenic temperature range in which a quantum circuit operates, and wherein any intervening material exhibits at least a second threshold level of thermal conductivity, wherein the threshold level of thermal conductivity is achieved at a cryogenic temperature range in which a quantum circuit operates.