Josephson Junction Test Device with Integrated Resonators
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Solution Overview
Problem
Testing multiple Josephson junction devices efficiently at cryogenic temperatures is time-consuming due to the need for extensive performance data gathering in superconducting quantum information systems.
Innovation Solution
A system comprising a feed line with input and output ports, connected to a first resonator and a Josephson junction device, allowing for the application of a microwave signal and measurement of frequency response to evaluate component performance, utilizing capacitive coupling with quality factors to accurately measure losses in the devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple Josephson junction devices are tested individually at cryogenic temperatures, then performance data can be gathered for each device, but the testing process becomes time-consuming
Solution Approach 1:
The patent combines multiple Josephson junction devices into a single integrated test structure where multiple devices are connected in parallel to common input and output nodes. This allows simultaneous testing of multiple devices through a single measurement port, reducing the testing cycle time while maintaining the ability to gather individual performance data for each device.
Solution Approach 2:
The test structure creates a universal measurement platform that can evaluate multiple different Josephson junction devices using the same cryogenic test setup and measurement procedure. The standardized interface and measurement method allow the system to efficiently test various devices without requiring separate testing configurations for each device.
2Reliability
If extensive performance data is gathered for each Josephson junction device, then accurate evaluation is achieved, but the testing process becomes complex and time-consuming
Solution Approach 1:
The patent segments the measurement process by using distinct resonator circuits for different measurement functions. One resonator is dedicated to measuring quality factor (Q-factor) while another is used for critical current measurement. This segmentation allows each measurement type to be performed independently through the same test structure, simplifying the overall testing process while maintaining comprehensive performance evaluation.
Solution Approach 2:
The patent introduces resonator circuits as intermediary elements between the Josephson junction devices and the measurement system. These resonators act as mediators that translate device performance characteristics into measurable signal responses, enabling accurate extraction of performance parameters without requiring direct complex measurements of the devices themselves.
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 testing of multiple Josephson junction devices in a single cycle by accurately measuring losses and quality factors, improving the evaluation process and reducing testing time.
Implementation Method 1
utilizing capacitive coupling with quality factors to accurately measure losses in the devices
Implementation Method 2
a first resonator connected to the feed line and a first Josephson junction device connected to the first resonator and ground
Implementation Method 3
applying a microwave signal and measurement of frequency response
Data Source
AI summary
An apparatus for measuring component performance including a feed line having an input port and an output port, a first resonator connected to the feed line, a first Josephson junction device connected to the first resonator and to ground, and a second resonator connected to the feed line and to ground.