Quantum Component With Suspension Electrodes And Magnetic Field
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Solution Overview
Problem
Current quantum computing architectures face challenges in scaling due to limited control over confinement potential and electrochemical potential in depletion-mode devices, and carbon nanotubes are prone to defects and pollution that degrade their properties, leading to quantum misalignment and reduced reproducibility.
Innovation Solution
A quantum component architecture featuring a substrate with suspension electrodes, a nano-object element with quantum dots, and a magnetic electrode to apply an inhomogeneous magnetic field, along with a microwave gate electrode connected to a microwave circuit, which allows for improved control over quantum states and reduced noise through precise electrostatic potential modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If depletion-mode gate patterns are used to confine electrons in quantum dots, then quantum calculation criteria can be demonstrated, but control over confinement potential and electrochemical potential is limited, making scaling to tens or hundreds of quantum dots difficult
Solution Approach 1:
The patent inverts the conventional depletion-mode approach by using accumulation-mode quantum dots where the 2DEG is not depleted but rather accumulated and controlled directly under the gates. This allows gates to have direct control over the electronic wave function region rather than indirectly controlling the surrounding electrostatic potential, thereby achieving both reliable quantum operation and scalable control.
Solution Approach 2:
The patent changes the operational parameter regime from depletion-mode to accumulation-mode, fundamentally altering how the quantum dots function. By operating in accumulation-mode, the system achieves superior control over confinement potential and electrochemical potential, enabling independent adjustment of tunnel couplings and electrochemical potential without requiring extreme voltages that would cause dielectric breakdown.
2Stability of the object's composition
If carbon nanotubes are used as host material for electron spin, then high crystalline purity and mechanical resistance are achieved, but defects and pollution degrade their properties, leading to quantum misalignment
Solution Approach 1:
The patent extracts the quantum dot system from the carbon nanotube host material, suspending the quantum dots above the gate electrodes rather than embedding them in nanotubes. This eliminates the harmful effects of defects and pollution in nanotubes while retaining the beneficial properties of high crystalline purity through carefully engineered gate structures and suspended quantum dot configurations.
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 configuration enhances the performance of quantum components by reducing quantum misalignment, improving control over quantum states, and increasing reproducibility, enabling more efficient scaling and operation in a cryogenic environment.
Implementation Method 1
at least one electrode comprises a magnetic material, referred to as at least one magnetic electrode, and is arranged and configured to apply an inhomogeneous magnetic field to the nano-object element over the spatial extent of the nano-object element
Implementation Method 2
at least one microwave gate electrode connected to a microwave circuit arranged to carry a microwave signal
Implementation Method 3
at least two suspension electrodes: a source electrode connected to an electron source and a drain electrode connected to a reference potential
Data Source
AI summary
A quantum component comprises: a substrate; two suspension electrodes; a plurality of gate electrodes arranged between the two suspension electrodes, the two suspension electrodes being raised relative to the gate electrodes; at least one nano-object element, in particular, a nanowire or a nanotube, suspended between the two suspension electrodes, the at least one nano-object element being placed above the gate electrodes, the electrodes of the quantum component comprising: a plurality of low frequency gate electrodes for defining electrostatic potentials in the nano-object element so as to enable at least two quantum dots to be formed in the nano-object element; at least one microwave gate electrode; and wherein at least one electrode comprises a magnetic material, preferably a ferromagnetic material, and is configured so as to apply an inhomogeneous magnetic field to the nano-object element over the spatial extent of the nano-object element.