Topological superconducting device
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Solution Overview
Problem
Current proposals for topological qubits face challenges due to the suppressing effect of magnetic fields on superconductivity and material limitations, particularly in interfacing superconductors and semiconductors, which hinder the realization of these devices.
Innovation Solution
A topological superconducting device comprising three adjacent superconducting regions with unequal Fermi velocities and phase winding, eliminating the need for interfacing materials and external magnetic fields, achieved through gate-controlled superconductivity and periodic modulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic field is applied to induce topological superconductivity, then topological qubit functionality is achieved, but superconductivity is suppressed
Solution Approach 1:
The patent extracts and eliminates the magnetic field requirement from the topological qubit system. By using a single superconducting material with spin-orbit coupling and phase winding, the invention removes the need for external magnetic fields while maintaining topological superconductivity and Majorana zero modes.
Solution Approach 2:
The patent changes the fundamental parameters of the system by using unequal Fermi velocities for spin-up and spin-down electrons instead of magnetic field-induced Zeeman splitting. This parameter change allows topological superconductivity to emerge without magnetic field suppression.
2Reliability
If multiple materials are interfaced to create topological superconducting device, then device functionality is achieved, but material limitations and interface complexity increase
Solution Approach 1:
The patent merges multiple material functions into a single superconducting material. The material simultaneously provides superconductivity, spin-orbit coupling, and the necessary band structure for unequal Fermi velocities, eliminating the need for interfaces between superconductors and semiconductors.
Solution Approach 2:
The patent employs a universal approach where a single superconducting material performs multiple functions: it provides the superconducting condensate, the spin-orbit coupling, and the electronic band structure necessary for topological superconductivity, making the device simpler and more robust.
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
Induces topological superconductivity in a magnetic-field-free environment, enabling the development of quantum computers and arrays of topological devices without the need for complex material interfaces.
Implementation Method 1
the three adjacent superconducting regions exhibit phase winding
Implementation Method 2
three adjacent superconducting regions, comprising at least one material
Implementation Method 3
the gate can induce superconductivity
Data Source
Figure 1A~1F
Figure 2A
Figure 2B~2C
AI summary
Provided is a topological superconductivity device based on phase control. The invention relies on two key ingredients: at least three superconducting forming at least two SNS junctions with phase winding, and unequal Fermi velocities for the two spin branches transverse to the junction. The two phase differences between the three superconductors define a two-dimensional parameter plane which includes large topological regions. Arrays of topological devices are disclosed which comprise a plurality of individual topological devices. Material platforms are provided which exhibit unequal Fermi velocities.