Self-Aligned Exchange Gates for Dense Quantum Gate Layouts
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Solution Overview
Problem
Existing methods for manufacturing exchange gates in quantum computing devices suffer from high risks of short circuits due to misalignment, leading to increased device surface area and reduced density.
Innovation Solution
A method for manufacturing self-aligned exchange gates involving conformal deposition and anisotropic etching of spacer and liner layers, followed by selective etching and photolithography steps to ensure precise alignment without offset contacts, reducing the risk of short circuits and minimizing device surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset contacts are used to prevent short circuits between front gates and exchange gates, then short circuit risk is reduced, but device surface area increases
Solution Approach 1:
The exchange gate contacts are automatically positioned directly above the exchange gates through self-aligned formation. The spacer layer thickness precisely controls the lateral positioning, making the structure self-correcting and eliminating the need for offset design. This self-service mechanism simultaneously achieves short circuit prevention and minimal surface area occupation.
Solution Approach 2:
The invention transitions from planar offset contact arrangement to vertical alignment in the third dimension. Contacts are positioned directly above gates in the vertical dimension, utilizing the z-axis for alignment rather than lateral offset in the x-y plane. This dimensional change reduces surface area while maintaining electrical isolation.
2Manufacturing precision
If complex manufacturing methods with multiple chemical mechanical polishing steps are used, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The invention replaces mechanical chemical mechanical polishing processes with conformal deposition and anisotropic etching. Instead of using mechanical abrasion and polishing to achieve alignment, the process uses self-aligned spacer formation through conformal deposition followed by directional etching, eliminating complex mechanical processing steps.
Solution Approach 2:
The self-aligned spacer formation process automatically positions exchange gate contacts directly above gates without requiring complex alignment procedures. The spacer layer thickness self-determines the lateral position, making the process self-correcting and eliminating the need for multiple polishing and alignment steps.
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 method achieves self-aligned exchange gates with reduced short-circuit risks and minimized surface area, enhancing device density and efficiency.
Implementation Method 1
a step of conformally depositing a liner layer on the starting structure; a step of conformally depositing a layer of a spacer material on the liner layer
Implementation Method 2
a step of anisotropic etching the layer of spacer material; a step of anisotropic etching the liner layer
Implementation Method 3
a step of selectively etching the layer of spacer material exposed during the previous photolithography step
Data Source
AI summary
A method manufactures exchange gates from a starting structure including a substrate and, disposed on the substrate, a plurality of gate stacks, each gate stack including, a layer of a conductive or semiconductor material and a layer of a hard mask.