Superconducting Resonator Temperature Mapping via Kinetic Inductance
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Solution Overview
Problem
Conventional techniques for determining temperature distribution in quantum computing devices, such as superconductive qubits, are ineffective due to non-negligible distances between temperature sensors and the devices, and temperature differences within the devices, making it difficult to maintain a uniform temperature below 100 milli-Kelvin for extended operation.
Innovation Solution
A system and method that divide quantum computing device layouts into temperature regions, determine temperatures based on frequency shifts in superconducting resonators due to kinetic inductance changes, and generate maps to characterize temperature distributions, allowing for autonomous and efficient temperature monitoring and potential adjustments to achieve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature sensors are used to determine temperature distribution in quantum computing devices, then temperature measurement capability is provided, but measurement precision deteriorates due to non-negligible distances between sensors and devices
Solution Approach 1:
The patent uses frequency shift as an intermediary parameter to indirectly measure temperature. Instead of placing physical sensors close to the quantum devices, the system measures frequency shifts of superconducting resonators that are sensitive to temperature changes through kinetic inductance variations. This intermediary approach allows temperature inference at a distance without direct thermal contact.
Solution Approach 2:
The patent replaces the mechanical/physical temperature sensing system with an electromagnetic field-based measurement system. By using frequency shift detection of superconducting resonators, the system substitutes direct thermal measurement with electromagnetic property measurement, eliminating the need for physical proximity between sensors and devices.
2Measurement precision
If temperature sensors are positioned close to quantum computing devices to improve measurement precision, then temperature distribution can be accurately determined, but device complexity increases due to additional sensor integration requirements
Solution Approach 1:
The patent makes the superconducting resonators serve multiple functions: they act as both quantum computing components and temperature sensing elements. The resonators' frequency shifts due to kinetic inductance changes provide temperature information, eliminating the need for separate dedicated temperature sensors and reducing overall device complexity.
Solution Approach 2:
The quantum computing device components themselves (superconducting resonators) perform the temperature measurement function autonomously. The resonators inherently exhibit frequency shifts that encode temperature information, allowing the device to self-diagnose its thermal state without external sensing infrastructure.
3Duration of action of stationary object
If temperature monitoring is performed continuously to maintain uniform temperature below 100 milli-Kelvin, then device longevity is extended, but use of energy increases due to continuous operation of monitoring systems
Solution Approach 1:
The patent employs periodic frequency shift measurements rather than continuous monitoring. By taking measurements at discrete intervals or in response to specific triggers, the system maintains temperature awareness while minimizing energy consumption compared to continuous operation. The frequency shift method allows for low-power periodic sampling of thermal conditions.
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
Enables efficient and effective determination of temperature distributions within quantum computing devices, facilitating the maintenance of uniform temperatures and prolonging device longevity by identifying and addressing temperature differences.
Implementation Method 1
a frequency shift exhibited by a superconducting resonator comprised within a quantum computing device layout due to a change in kinetic inductance
Data Source
AI summary
Techniques regarding determining and/or analyzing temperature distributions experienced by quantum computer devices during operation are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a memory that can store computer executable components. The system can also comprise a processor, operably coupled to the memory, and that can execute the computer executable components stored in the memory. The computer executable components can comprise a region component that can define a plurality of temperature regions from a quantum computing device layout. The computer executable component can also comprise a map component that can generate a map that characterizes a temperature distribution by determining at least one temperature achieved within the plurality of temperature regions during an operation of the quantum computing device layout.