Planar Dissipative Device Thermal Noise Reduction
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Solution Overview
Problem
Existing dissipative devices operating at ultra-low cryogenic temperatures face challenges in minimizing thermal noise due to inefficiencies in heat dissipation and electron cooling, which affects the performance of qubits and other cryogenic devices.
Innovation Solution
A dissipative device with a planar configuration featuring resistor elements and conductors on an insulating substrate, where the conductors act as heat sinks to conduct heat generated in the resistor elements to the substrate via electron-phonon coupling, utilizing materials with high electrical and thermal conductivity to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional dissipative devices are used at ultra-low temperatures, then thermal noise is generated due to inefficient heat dissipation, but the device structure and materials must be optimized to achieve effective heat conduction and electron cooling
Solution Approach 1:
The dissipative device is segmented into distinct functional regions: resistor elements for signal attenuation and heat sink regions for thermal management. This segmentation allows each region to be optimized independently - resistors for electrical performance and heat sinks for thermal conduction - thereby reducing thermal noise without requiring complete redesign of the entire device structure.
Solution Approach 2:
Different materials and geometries are applied locally to different regions of the device. Heat sink regions use high thermal conductivity materials (such as copper or aluminum) with increased volume and surface area, while resistor regions use materials optimized for electrical resistance. This local differentiation enables effective heat dissipation from specific hot spots without compromising the overall device simplicity.
2Loss of energy
If heat dissipation is enhanced through improved thermal conduction, then electron cooling efficiency increases, but the material selection and geometric configuration become more constrained
Solution Approach 1:
The heat sink structures are merged with the existing substrate or housing of the dissipative device, eliminating the need for separate heat dissipation components. By integrating heat sink regions directly into the device structure using materials like copper or aluminum, the design achieves improved heat dissipation while maintaining manufacturing simplicity and avoiding complex multi-material assemblies.
Solution Approach 2:
The dissipative device utilizes the natural thermal conduction properties of commonly available materials (copper, aluminum) to self-cool without requiring external active cooling systems. The heat sink regions automatically conduct heat away from resistor elements through their inherent high thermal conductivity, enabling the device to manage its own thermal load using readily manufacturable materials.
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 effectively reduces thermal noise in cryogenic devices by maximizing heat dissipation and electron cooling, maintaining minimal noise levels even at ultra-low temperatures, thereby improving the performance of qubits and other sensitive cryogenic systems.
Implementation Method 1
the conductors act as heat sinks, which conduct heat generated in the resistor element(s) to the underlying substrate
Implementation Method 2
to cool hot electrons generated by the resistor element(s) via electron-phonon coupling
Data Source
AI summary
A dissipative device has a planar configuration with one or more resistor elements formed on an insulating substrate. Conductors are formed on the insulating substrate and are coupled to the resistor element(s) to transmit signals to/from the resistor element(s). The geometry of and materials for the dissipative device allow the conductors to act as heat sinks, which conduct heat generated in the resistor element(s) to the substrate (and on to a coupled housing) and cool hot electrons generated by the resistor element(s) via electron-phonon coupling. The dissipative device can be used in cooling a signal to a qubit, a cavity system of a quantum superconducting qubit, or any other cryogenic device sensitive to thermal noise.