Superconducting Ring Qubits via Electrostatic Gating
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Solution Overview
Problem
Existing superconducting qubits face variability in fabrication processes and sensitivity to magnetic noise due to the use of insulating barriers or interruptions in the ring, which affect coherence times and scalability in quantum computing.
Innovation Solution
A qubit design that employs an electric field generator to apply an electric field in the plane of a superconducting ring, combined with a magnetic field orthogonal to the ring, allowing for tunable transition frequencies and reduced process variability by eliminating the need for insulating barriers, thus achieving longer coherence times and reduced magnetic noise sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating barriers or interruptions are used in the superconducting ring to break rotational symmetry, then a qubit can be formed, but fabrication process variability increases and coherence time decreases
Solution Approach 1:
The patent removes the insulating barrier (Josephson junction) from the superconducting ring, extracting the problematic element that causes fabrication variability. Instead of having a permanent structural interruption, the symmetry breaking is achieved dynamically through external magnetic fields and electric field generators, eliminating the source of manufacturing precision issues while maintaining qubit functionality.
Solution Approach 2:
The patent transitions from a static structural interruption (insulating barrier) to a dynamic control mechanism using external magnetic fields and electric field generators. The rotational symmetry is broken dynamically through time-varying fields rather than fixed structural asymmetry, allowing the system to maintain coherence while avoiding fabrication variability associated with permanent interruptions in the ring.
2Adaptability or versatility
If magnetic fields are applied to tune qubit transition frequency, then frequency tuning is achieved, but magnetic noise sensitivity increases
Solution Approach 1:
The patent introduces electric field generators as intermediary elements that couple to the superconducting ring without requiring direct magnetic field application for frequency tuning. The electric fields act as a mediator to achieve the desired frequency modulation while avoiding the harmful magnetic noise that would result from direct magnetic field tuning methods.
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 enables longer coherence times and reduced sensitivity to magnetic noise, facilitating the development of scalable quantum computing devices with improved qubit stability and performance.
Implementation Method 1
electrostatic gating superconducting rings; applying an electric field in a plane of the superconducting ring
Implementation Method 2
The quantization of magnetic flux in superconductors lies at the heart of realizing quantum bits; the enclosed flux is an integer multiples of the flux quantum Φ=h/(2|e|)
Implementation Method 3
When a superconducting ring is placed in an external magnetic field, current flows to expel the field from the bulk of the ring
Implementation Method 4
superconducting qubits may be among the major scalable platform; longer coherence times can be obtained in qubits according to embodiments of the disclosed technology
Data Source
AI summary
The disclosed technology generally relates to superconducting devices, and more particularly to superconducting rings, qubits comprising the superconducting rings and methods of coherently coupling flux states of the superconducting rings. In one aspect, a qubit includes a superconducting ring around a hole. The qubit additionally includes an electric field generator adapted for applying an electric field in a plane of the superconducting ring over at least part of the superconducting ring, and a magnetic field generator adapted for applying a magnetic field component orthogonal to the plane of the superconducting ring such that the magnetic field component at least crosses the hole of the ring.