Superconducting Resonator Thermometry for Cryogenic Qubit Stability
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Solution Overview
Problem
Determining the temperature of superconducting quantum computing devices is challenging due to the properties of these devices, which affect conventional thermodynamic measurement methods, and is crucial for maximizing the longevity of superconductive qubits by maintaining thermal energy below quantum energy levels.
Innovation Solution
A system and method using superconducting resonators to measure temperature by simulating operation at a reference temperature, measuring operating frequency, and determining temperature based on frequency shifts due to kinetic inductance changes, employing computer-implemented components and cloud computing environments for autonomous and efficient temperature determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional thermodynamic means (conduction, convection, radiation) are used to measure temperature, then temperature measurement is achieved, but the quantum computing device operation is affected and measurement precision is insufficient due to device properties
Solution Approach 1:
The patent introduces a superconducting resonator as an intermediary element that couples to the quantum computing device. The resonator measures temperature through its kinetic inductance properties without directly interfering with the quantum device operation. The resonator's resonant frequency shifts in response to temperature changes, providing a non-intrusive measurement mechanism that maintains quantum device stability while achieving precise temperature determination.
2Duration of action of stationary object
If thermal energy is reduced to maximize qubit longevity, then qubit longevity is improved, but temperature measurement becomes more difficult due to lower thermal signals
Solution Approach 1:
The patent exploits the temperature-dependent kinetic inductance parameter of superconducting materials. By measuring changes in the resonator's resonant frequency, which is directly related to kinetic inductance, the system can detect temperature variations even at cryogenic temperatures where thermal energy is minimal. This parameter-based measurement approach enables accurate temperature sensing without requiring high thermal signals, thus maintaining both qubit longevity and measurement capability.
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 accurate and autonomous temperature measurement of superconducting quantum devices, improving the longevity of qubits by effectively managing thermal energy levels through precise frequency analysis.
Implementation Method 1
measuring an operating frequency exhibited by the one or more superconducting resonators during operation of the one or more quantum computing devices. The temperature can then be determined based on a frequency shift exhibited by the one or more superconducting resonators due to a change in kinetic inductance with a change in temperature.
Implementation Method 2
A system and method using superconducting resonators to measure temperature by simulating operation at a reference temperature, measuring operating frequency, and determining temperature based on frequency shifts due to kinetic inductance changes
Data Source
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AI summary
Techniques regarding determining the temperature of one or more quantum computing devices are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a temperature component that can determine a temperature of a superconducting resonator based on a frequency shift exhibited by the superconducting resonator due to a change in kinetic inductance with a change in temperature.