Quantum Processor Inter-Cell Coupling via Qubit Crossing
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Solution Overview
Problem
Existing quantum processor architectures have limited interaction between unit cells, making it difficult to solve certain complex problems that require more inter-cell qubit interconnections.
Innovation Solution
A new quantum processor architecture is designed with unit cells positioned proximally adjacent to each other, featuring qubits that cross over each other and controllable coupling devices to enable increased inter-cell interactions, allowing for more flexible and complex qubit interconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed quantum processor architecture is used, then the device structure is simple and easy to manufacture, but the inter-cell qubit interactions are limited
Solution Approach 1:
The patent introduces a second dimension of coupling by adding inter-cell coupling devices that enable qubits in adjacent unit cells to interact. This is achieved by extending the coupling capability from intra-cell (within same unit cell) to inter-cell (between adjacent unit cells) interactions, effectively adding a spatial dimension to the quantum processor's connectivity architecture.
Solution Approach 2:
The quantum processor is divided into multiple identical unit cells, each containing a specific arrangement of qubits and coupling devices. This segmentation allows the system to scale while maintaining consistent interaction patterns, and the inter-cell coupling devices enable these segmented units to work together with enhanced connectivity.
2Adaptability or versatility
If qubits are arranged in traditional non-crossing configurations, then the device layout is simple, but the embedding capability for complex problems is reduced
Solution Approach 1:
The patent employs qubits that cross between different layers or planes, utilizing the third dimension (vertical stacking) to achieve crossings without requiring complex lateral routing. This dimensional transition allows qubits to interact with multiple neighbors in adjacent unit cells while maintaining a relatively simple planar layout at each layer.
Solution Approach 2:
The patent implements a multi-layered structure where qubits in different layers are nested vertically above each other. The crossing qubits are positioned in different layers, allowing them to interact through vertical coupling while maintaining horizontal separation, effectively nesting the coupling paths in the vertical dimension.
Data Source
AI summary
Quantum processor architectures employ unit cells tiled over an area. A unit cell may include first and second sets of qubits where each qubit in the first set crosses at least one qubit in the second set. Each unit cell is positioned proximally adjacent at least one other unit cell. Within each unit cell, at least one qubit is longitudinally shifted with respect to at least one other qubit such that the longitudinally-shifted qubit crosses at least one qubit in a proximally adjacent unit cell. Communicative coupling between qubits is realized through respective intra-cell and inter-cell coupling devices. The longitudinal shifting of qubits and resultant crossing of qubits in proximally adjacent unit cells enables quantum processor architectures that can be better suited to solve certain problems.