Superconducting Phase Shifter for Qubit Noise Isolation
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Solution Overview
Problem
Existing phase shifting methods in superconducting electronics face challenges such as noise interference, complex circuit configurations, and inefficient use of chip area due to external magnetic fields and lead-in wire lines, which affect qubit performance and integration.
Innovation Solution
A phase shifting method using a fractional flux quantum captured by a multicomponent superconductor, separated from the target circuit in direct current, generates a vector potential for phase shift without external power supply, minimizing noise interference and allowing for compact circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external magnetic fields and lead-in wire lines are used for phase shifting, then phase shift can be achieved, but noise interference increases and qubit performance deteriorates
Solution Approach 1:
The patent extracts the phase shifting function from external components (external magnetic fields and lead-in wire lines) and relocates it to an on-chip superconducting phase shifter. This removes the noise-generating external connections while maintaining the phase shift capability, directly resolving the contradiction between achieving phase shift and avoiding noise interference
Solution Approach 2:
The patent introduces a superconducting phase shifter as an intermediary component that generates the necessary vector potential and phase shift locally on the chip. This intermediary eliminates the need for external magnetic fields and lead-in wires, thereby removing the noise pathway while preserving the phase shifting function
2Device complexity
If external magnetic fields and lead-in wire lines are used for phase shifting, then phase shift can be achieved, but circuit configuration becomes complex and chip area increases
Solution Approach 1:
The patent merges the phase shifting function with the on-chip superconducting circuit by integrating a superconducting phase shifter directly into the chip. This eliminates the need for separate external magnetic field generation systems and lead-in wire configurations, simplifying the overall circuit design and reducing chip area
Solution Approach 2:
The patent transitions the phase shifting mechanism from an external spatial arrangement (external coils and wires) to an integrated on-chip configuration. This dimensional reorganization consolidates the phase shifting functionality within the chip's existing superconducting circuit plane, reducing complexity and area requirements
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
This approach stabilizes phase shifts, reduces noise impact, and enables efficient use of chip area by separating the phase shifter from the target circuit, improving qubit performance and integration while avoiding material contamination risks.
Implementation Method 1
a phase shifting method using a fractional flux quantum captured by a multicomponent superconductor, separated from the target circuit in direct current, generates a vector potential for phase shift
Implementation Method 2
a superconductor is disposed directly under or directly above a closed-loop circuit... a phase shift is caused to occur in the target closed-loop circuit by using a vector potential that is generated by a fractional flux quantum captured by the superconductor
Data Source
AI summary
Proposed is a phase shift introduction method, a structure, and a circuit device for eliminating or minimizing a risk associated with dissimilar materials, solving in principle a problem of mixing of a signal current and a control current that occurs due to DC connection of a phase shifter to a signal line, and stably and reliably providing a phase shift that is desired to be introduced without being adversely effected by noise generated by an ambient magnetic field, which is generated due to use of an external power supply. A structure according to the present invention includes a phase shifter 101 and a closed-loop circuit 103 that is directly used for computation or storage, and a quantum phase shift is generated in the closed-loop circuit 103 by using a fractional flux quantum captured by the phase shifter 101 that is DC-separated from the closed-loop circuit 103.