Hyperbolic Magnet Spin Qubit Control via Magnetic Gradient
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Solution Overview
Problem
Current quantum computing technologies face challenges in efficiently initializing and manipulating qubits due to limitations in controlling and addressing individual spin qubits within a large-scale qubit system.
Innovation Solution
The implementation of an electronic device with a hyperbolic magnet adjacent to an accumulation gate, featuring a pair of separated magnet portions with convex surfaces, generates a magnetic field with a large gradient. This setup allows for the coherent control of electron or hole spins through electric dipole spin resonance (EDSR), enabling efficient qubit manipulation and addressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional magnet configurations are used to control spin qubits, then the system can maintain simplicity in structure, but the rotation speed of spins and qubit fidelity deteriorate due to insufficient magnetic field gradient
Solution Approach 1:
The patent employs a hyperbolic magnet configuration with curved surfaces instead of conventional flat or simple geometric magnet structures. This curvature design creates a non-uniform magnetic field with large gradient across the quantum dot array, enabling fast spin rotation and high-fidelity qubit control while maintaining a relatively compact structure.
Solution Approach 2:
The hyperbolic magnet is positioned adjacent to the accumulation gate, creating a localized region of high magnetic field gradient precisely where the quantum dots are located. This local concentration of magnetic field strength and gradient enhances spin manipulation efficiency without requiring the entire device structure to be complex.
2Ease of operation
If conventional magnetic field configurations are used, then the device structure remains simple, but individual addressing of spins in different quantum dots becomes difficult
Solution Approach 1:
The hyperbolic geometry of the magnet creates a spatially varying magnetic field gradient that differs at each quantum dot position. This allows individual quantum dots to experience distinct magnetic field conditions, enabling selective addressing and control of specific spin qubits through resonant frequency differences.
Solution Approach 2:
The patent utilizes the magnetic field gradient to create different Larmor frequencies for spins in different quantum dots. By tuning the magnetic field gradient parameter through the hyperbolic magnet geometry, each quantum dot can be individually addressed by applying microwave pulses at its specific resonant frequency.
3Reliability
If uniform magnetic field is applied to quantum dots, then the magnet configuration remains simple, but qubit fidelity deteriorates due to inability to perform coherent spin control
Solution Approach 1:
The curved hyperbolic surfaces of the magnet generate a controlled non-uniform magnetic field that provides the necessary field gradient for coherent spin manipulation. This gradient enables precise control of spin precession frequencies, which is essential for high-fidelity quantum gate operations and error correction.
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 use of a hyperbolic magnet with a large gradient magnetic field enhances the rotation speed of spins, improves qubit fidelity, and allows for individual addressing of spins in different quantum dots, thereby overcoming the limitations of current qubit control methods.
Implementation Method 1
The implementation of an electronic device with a hyperbolic magnet adjacent to an accumulation gate, featuring a pair of separated magnet portions with convex surfaces, generates a magnetic field with a large gradient. This setup allows for the coherent control of electron or hole spins through electric dipole spin resonance (EDSR)
Data Source
AI summary
An electronic device includes a substrate, a hyperbolic magnet, a pair of depletion gates, a pair of barrier gates and a accumulation gate. The hyperbolic magnet is over the substrate and has a first magnet portion and a second magnet portion separated from each other. The first magnet portion and the second magnet portion have a first convex surface and a second convex surface facing the first convex surface, respectively. The depletion gates are separated from each other and between the first convex surface and the second convex surface over the substrate. The barrier gates are between the depletion gates. The accumulation gate is over the depletion gates and between the barrier gates.