Staircase Quantum Well Gate Control for Interaction Distance
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Solution Overview
Problem
Current quantum computers using superconducting structures are large, costly, and difficult to scale, and traditional FET transistor structures result in degraded performance due to fixed distances between rectangular semiconductor wells, making it hard to implement reliable quantum computing flows.
Innovation Solution
The use of staircase well shapes in semiconductor quantum structures allows for variable interaction distances between quantum particles, enabling strong interactions at short distances and negligible interactions at longer distances through diagonal, lateral, and vertical transport, and is applicable in both planar and 3D semiconductor processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional FET transistor structures with rectangular semiconductor wells are used, then manufacturing is simpler, but interaction distance is fixed and performance is degraded
Solution Approach 1:
The semiconductor well is segmented into multiple sections with different depths, creating a staircase configuration. This segmentation allows each section to be independently controlled, enabling variable interaction distances between quantum particles while maintaining manufacturability through standard semiconductor processing techniques.
Solution Approach 2:
The invention transitions from traditional 2D rectangular wells to 3D staircase wells with varying depths. This dimensional change enables control over interaction distances in the vertical dimension, allowing quantum particles to interact at different distance scales within the same well structure.
2Reliability
If superconducting structures are used for quantum computing, then quantum effects are achieved, but device size is large and scalability is difficult
Solution Approach 1:
The invention uses semiconductor structures that replicate quantum effects typically associated with larger superconducting systems. By creating quantum wells in semiconductor materials, the system copies quantum behavior in a miniaturized form that can be scaled using established semiconductor manufacturing processes, enabling higher productivity and scalability.
Solution Approach 2:
The invention changes the material parameter from superconducting materials to semiconductor materials, while maintaining quantum functionality. This parameter change allows the system to achieve quantum effects in a more scalable platform with smaller device dimensions and compatibility with existing manufacturing infrastructure.
3Adaptability or versatility
If fixed distance rectangular wells are used, then manufacturing is easier, but quantum interaction control is limited
Solution Approach 1:
The staircase well structure enables dynamic control over quantum particle interactions by allowing particles to occupy different vertical levels. This creates variable interaction distances that can be controlled through electrostatic gating, providing adaptability for different quantum computing operations while using standard fabrication techniques.
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 approach enables the creation of optimized semiconductor quantum structures with strong and controlled interactions, improving the reliability and scalability of quantum computing processes.
Implementation Method 1
The use of staircase well shapes in semiconductor quantum structures allows for variable interaction distances between quantum particles, enabling strong interactions at short distances and negligible interactions at longer distances through diagonal, lateral, and vertical transport
Data Source
AI summary
A novel and useful modified semiconductor process having staircase active well shapes that provide variable distances between pairs of locations (i.e. quantum dots) resulting in modulation of the quantum interaction strength from weak/negligible at large separations to moderate and then strong at short separations. To achieve a modulation of the distance between pairs of locations, diagonal, lateral, and vertical quantum particle/state transport is employed. As examples, both implementations of semiconductor quantum structures with tunneling through an oxide layer and with tunneling through a local well depleted region are disclosed. These techniques are applicable to both planar semiconductor processes and 3D (e.g. Fin-FET) semiconductor processes. Optical proximity correction is used to accommodate the staircase well layers. Each gate control circuit in the imposer circuitry functions to control more than one set of control gates. Thus, each gate control circuit is shared across several qubits which are located sufficiently far from each other to prevent interference. This substantially reduces the number of control signals and control logic that required in the structure.