Semiconductor Quantum Dot Tunneling Control Gates
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Solution Overview
Problem
Current quantum computers face challenges in isolating microscopic particles, loading them with information, and preserving quantum interactions due to noise, requiring low temperatures and struggling with scalability and cost issues with superconducting structures.
Innovation Solution
Semiconductor-based planar and 3D quantum structures utilizing tunneling through an oxide layer or local depleted wells to construct quantum dots and qubits, allowing controlled interaction and entanglement of particles, with control gates modulating tunneling between regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superconducting structures are used to implement quantum computers, then quantum interactions can be achieved, but the cost and device complexity increase significantly
Solution Approach 1:
The patent replaces expensive superconducting structures with semiconductor-based quantum structures that use standard semiconductor manufacturing processes. The quantum dots are formed using conventional doping techniques and oxide layers that are already part of standard semiconductor fabrication, eliminating the need for specialized superconducting materials and complex cryogenic infrastructure.
Solution Approach 2:
The patent substitutes superconducting mechanical systems with semiconductor electronic systems. Instead of using superconducting circuits and magnetic fields, the invention uses electrically controlled semiconductor quantum dots where tunneling barriers are modulated by gate voltages, replacing complex mechanical and magnetic control systems with simple electrical control.
2Reliability
If superconducting structures are used to implement quantum computers, then quantum interactions can be achieved, but scalability becomes difficult
Solution Approach 1:
The patent creates a universal semiconductor-based quantum structure that can be fabricated using standard semiconductor manufacturing processes applicable to both quantum and classical devices. The same doping, oxidation, and gating techniques used in conventional semiconductor fabrication are applied to create quantum dots, allowing quantum structures to be integrated with classical control circuits and scaled using existing manufacturing infrastructure.
Solution Approach 2:
The patent changes the operational parameters from superconducting temperatures to lower but more achievable temperatures for semiconductor operation. By adjusting the bandgap and doping levels, the quantum tunneling behavior can be controlled and optimized for quantum computation while maintaining compatibility with standard semiconductor processing temperatures and enabling broader scalability.
3Stability of the object's composition
If low temperatures are used to preserve quantum interactions, then quantum state stability improves, but the operational complexity and cost increase
Solution Approach 1:
The patent changes the temperature parameter from near-absolute-zero superconducting temperatures to higher temperatures where semiconductor materials can maintain quantum coherence. By selecting appropriate semiconductor materials with suitable bandgaps and optimizing doping concentrations, the quantum states remain stable at temperatures that are more manageable and less costly to maintain.
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
Enables efficient modulation of quantum particle interactions and entanglement at lower temperatures, potentially improving scalability and reducing costs compared to superconducting structures.
Implementation Method 1
a second electrical potential applied to the control gate is operative to generate a control barrier between the first quantum dot and the second quantum dot, whereby lowering the control barrier allows one or more quantum particles to travel between the first quantum dot and the second quantum dot through a tunneling path
Data Source
AI summary
Novel and useful quantum structures having a continuous fully depleted well with control gates that form two quantum dot on either side of the gate. Appropriate potentials are applied to the well and control gate to control quantum tunneling between quantum dots thereby enabling quantum operations to occur. Qubits are realized by modulating applied gate potential to control tunneling through a quantum transport path between two or more sections of the well. Complex structures with a higher number of quantum dots per continuous well and a larger number of wells can be fabricated. Both planar and 3D FinFET semiconductor processes are used to build well to gate and well to well tunneling quantum structures. An injection device permits tunneling of a single quantum particle from a classic side to a quantum side of the device. Detection interface devices detect the presence or absence of a particle destructively or nondestructively.