Superconducting SQUID Loop Layout for Crosstalk Isolation
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Solution Overview
Problem
Crosstalk occurs in superconducting circuits due to magnetic field interactions between multiple SQUIDs, affecting the independent control of resonance frequencies in quantum interference devices.
Innovation Solution
A superconducting circuit design incorporating a ground plane, non-conductive parts, and multilevel wiring lines forming a superconducting loop around SQUIDs, where the SQUIDs are positioned to minimize magnetic field interference by controlling the bias current flow, thereby reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic field is applied to one SQUID to change its resonance frequency, then the resonance frequency of that SQUID is adjusted, but a magnetic field is also generated in other SQUIDs causing crosstalk
Solution Approach 1:
The ground plane is segmented into a first ground plane and a second ground plane that are electrically isolated from each other. The first SQUID is associated with the first ground plane while the second SQUID is associated with the second ground plane. This segmentation creates independent return current paths for each SQUID, preventing magnetic field coupling between them and eliminating crosstalk while maintaining precise resonance frequency control for each device
Solution Approach 2:
Each SQUID is provided with its own dedicated ground plane (first ground plane for first SQUID, second ground plane for second SQUID) with independent return current paths. This local quality assignment ensures that magnetic flux generated by bias current in one SQUID is confined to its local ground plane and does not interfere with other SQUIDs, thereby reducing crosstalk while maintaining frequency control precision
2Adaptability or versatility
If multiple SQUIDs are controlled independently, then each SQUID can be adjusted separately, but magnetic field interference between them increases crosstalk
Solution Approach 1:
The ground plane is divided into multiple electrically isolated ground planes (first ground plane, second ground plane, etc.), each dedicated to a specific SQUID. This segmentation allows independent control of each SQUID while confining magnetic field interference to local areas, preventing interference between independently controlled devices
Solution Approach 2:
The ground plane acts as an intermediary structure that provides separate return current paths for bias currents of different SQUIDs. By introducing this intermediary ground plane structure, independent control of multiple SQUIDs is maintained while magnetic field interference is prevented through spatial separation of current paths
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 design effectively reduces crosstalk by managing magnetic flux within the superconducting loop, allowing for more precise control of resonance frequencies and improving the performance of superconducting circuits.
Implementation Method 1
a superconducting quantum interference device configured to set a resonance frequency of a first superconducting part included in the plurality of superconducting parts
Implementation Method 2
a ground plane including a superconducting member; a plurality of superconducting parts surrounded by a non-conductive part so as to be spaced from the ground plane
Implementation Method 3
a multilevel wiring line configured to form, in cooperation with the ground plane, a superconducting loop surrounding the superconducting quantum interference device, in which the superconducting quantum interference device is disposed, in an area inside the superconducting loop, at a place where a magnetic field generated by a current from a bias line for the first superconducting part is applied
Data Source
AI summary
In an aspect, the present disclosure provides a superconducting circuit including: a ground plane including a superconducting member; a plurality of superconducting parts surrounded by a non-conductive part with space from the ground plane, each of the plurality of superconducting parts including four coupling ports each configured to enable the superconducting part to interact with another superconducting part; a superconducting quantum interference device configured to set a resonance frequency of a first superconducting part included in the plurality of superconducting parts; and a multilevel wiring line configured to form, in cooperation with the ground plane, a superconducting loop surrounding the superconducting quantum interference device, in which the superconducting quantum interference device is disposed, in an area inside the superconducting loop, at a place where a magnetic field generated by a current from a bias line for the first superconducting part is applied.