Quantum Dot Devices With Patterned Gates And Curved Spacers
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Solution Overview
Problem
Current quantum computing technologies face challenges in achieving strong spatial localization and control over quantum dots, scalability, and design flexibility for electrical connections, which are crucial for effective quantum logic operations.
Innovation Solution
The development of quantum dot devices with patterned gates, including a quantum well stack, spacers with curved surfaces, and multiple gates on each fin, allows for precise control over quantum dot formation and interaction, enabling strong spatial localization and scalability, as well as flexible electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional quantum computing technologies are used, then quantum mechanical phenomena can be utilized, but strong spatial localization and control over quantum dots cannot be achieved
Solution Approach 1:
The device segments the gate control into multiple independently controllable gates (first gate, second gate, third gate) positioned at different locations on the fin structure. This segmentation enables precise spatial localization of quantum dots by independently controlling potential wells at different positions, thereby achieving strong spatial control without excessive overall device complexity.
Solution Approach 2:
The patent applies local quality by creating distinct gate structures with different functions at different locations: accumulation gates for charge injection, plunger gates for quantum dot formation, and barrier gates for confinement. Each gate can be independently controlled to create specific local potential conditions, enabling precise spatial control of quantum dots while maintaining manageable device complexity through functional specialization.
2Productivity
If quantum dot devices are designed with multiple gates on each fin, then scalability is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by designing a modular gate structure where each fin can accommodate multiple gates with different functions (accumulation, plunger, barrier gates). This modular design enables scalability across the device while maintaining consistent structural patterns that prevent complexity from compounding. The same basic gate structure can be replicated and combined in various configurations to scale the device.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning multiple gates at different heights and locations on the fin structure. This three-dimensional gate arrangement allows multiple quantum dots to be controlled along the fin length and height, enabling scalability in the vertical dimension without increasing planar device footprint, thereby managing complexity through spatial efficiency.
3Adaptability or versatility
If electrical connections are made more flexible, then design flexibility improves, but manufacturing precision may be compromised
Solution Approach 1:
The patent segments the electrical connection system into multiple independently controllable gates, each with its own electrical connection path. This segmentation provides design flexibility by allowing independent control of different quantum dots and regions, while maintaining manufacturing precision through standardized gate structures that can be precisely fabricated and positioned. Each gate's electrical connection can be optimized independently without affecting the entire device.
Data Source
AI summary
Disclosed herein are quantum dot devices, as well as related computing devices and methods. For example, in some embodiments, a quantum dot device may include: a quantum well stack; a plurality of first gates disposed on the quantum well stack; a plurality of pairs of spacers, each pair of spacers disposed on opposites sides of an associated first gate, wherein each spacer in a pair has a curved surface that curves away from the associated first gate; and a plurality of second gates disposed on the quantum well stack, wherein the curved surface of each spacer is adjacent to one of the second gates such that at least a portion of each second gate is shaped complementarily to the curved surface of an adjacent spacer.