Quantum Memory Cell Array Wheel-and-Spokes Topology
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Solution Overview
Problem
Quantum computing devices face challenges in maintaining coherence and performance due to the large geometric size of linear arrays of memory cells, which leads to degradation in reliability and efficiency when increasing the number of linked cells.
Innovation Solution
The arrangement of memory cells in a wheel-and-spokes or star-like configuration reduces the geometric size of the array, utilizing controllable electrodes to localize charge carrier droplets laterally across memory cells and linkers, maintaining a continuous filling factor and coherent charge movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cells are arranged in a linear array to increase the number of linked cells, then the storage capacity increases, but the geometric size increases leading to coherence degradation
Solution Approach 1:
The patent transitions from a one-dimensional linear array to a two-dimensional planar grid arrangement of memory cells. This dimensional change allows multiple cells to be interconnected through multiple pathways (rows and columns), reducing the linear distance between cells while maintaining a high number of linked cells. The grid structure enables shorter intra-cell channels and more efficient inter-cell connections, thereby preserving coherence across the array.
2Reliability
If the geometric size of the memory cell array is reduced, then coherence across the droplet is improved, but the number of linkable cells is limited
Solution Approach 1:
By organizing memory cells in a two-dimensional grid rather than a linear sequence, the patent achieves higher cell density within a compact geometric footprint. This allows more cells to be linked together while maintaining short connection distances, thus preserving coherence. The grid topology provides multiple routing options that further optimize the path length between any two cells.
Solution Approach 2:
The patent employs controllable electrodes that can dynamically adjust the depletion regions and channel conductance. This dynamic control allows the system to optimize the electrical pathways between cells based on operational requirements, maintaining coherent charge carrier transport across the array while accommodating a larger number of linked cells within the coherent region.
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 coherence and reliability of quantum computing devices by reducing the geometric size of the memory cell array, improving performance and maintaining coherence across the droplet, even with multiple linked cells.
Implementation Method 1
the electrodes of the first and second patterns are controllable to deplete lateral areas of the quantum-well structure of charge carriers such that a droplet of the charge carriers in the semiconductor quantum-well structure is localized laterally along the planar surface
Data Source
AI summary
An array of interconnected memory cells for storing therein a fractional-quantum-Hall-effect droplet whose state is controllable using voltages applied to the cell electrodes. In an example embodiment, the memory cells are arranged and linked together such as to reduce the geometric size of the array, e.g., compared to that of a linear array having the same number of memory cells. For example, one or more wheel-and-spokes arrangements of the memory cells can be used for this purpose. The smaller geometric size of the array can result in better coherence across the droplet confined therein, which can advantageously be used to improve the reliability and/or performance of the corresponding quantum-computing device.