Quantum Processor Unit Cell Layout for Higher Qubit Connectivity
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Solution Overview
Problem
Existing quantum processor architectures, such as those described in U.S. Pat. No. 8,421,053, have limited interaction between unit cells, restricting the complexity and size of problems that can be solved due to fixed qubit interconnections, which hinders the ability to embed certain problem instances effectively.
Innovation Solution
A new quantum processor architecture is designed with increased inter-cell qubit interconnections by arranging qubits in a multi-layered structure where qubits from one set cross qubits in another set, and using controllable coupling devices to facilitate communicative coupling between qubits in adjacent unit cells, including diagonal interactions, thereby enhancing intra-cell and inter-cell interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If qubits are arranged in a fixed architecture with limited inter-cell interactions, then the device structure is simpler and easier to manufacture, but the connectivity between qubits is restricted, limiting the complexity of solvable problems
Solution Approach 1:
The patent introduces a multi-layered architecture where qubits are arranged in multiple vertical layers with coupling devices connecting qubits across different layers. This dimensional transition from planar to 3D architecture enables increased connectivity without proportionally increasing lateral space requirements, allowing qubits to interact with more neighbors in both intra-cell and inter-cell contexts.
Solution Approach 2:
The patent implements a hierarchical structure where unit cells are nested within larger processor architectures, and coupling devices are nested within the multi-layered qubit structure. Each unit cell contains qubits from different sets that are coupled through coupling devices, creating a nested organization that facilitates both local and global connectivity while maintaining structural order.
2Adaptability or versatility
If controllable coupling devices are added to facilitate communication between qubits in adjacent unit cells, then the problem-solving capability is enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the quantum processor into discrete unit cells, each containing a specific arrangement of qubits from different sets and their associated coupling devices. This segmentation allows for modular manufacturing where identical unit cells can be replicated and assembled, reducing overall manufacturing complexity despite the enhanced connectivity within each cell.
Solution Approach 2:
The coupling devices are designed to serve multiple functions: they enable communication between qubits within the same unit cell (intra-cell coupling) and between adjacent unit cells (inter-cell coupling). This multi-functionality reduces the total number of coupling devices needed compared to having separate coupling mechanisms for each interaction type, thereby easing manufacturing requirements.
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 architecture allows for more complex and larger problem instances to be embedded, improving the ability to solve problems that were previously difficult with fixed architectures by increasing the strength of qubit interactions and connectivity between unit cells.
Implementation Method 1
Each qubit comprises a loop of superconducting material interrupted by at least one Josephson junction. Each coupling device comprises a loop of superconducting material interrupted by at least one Josephson junction.
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. Angular deviations between qubits in one set may allow qubits in the same set to cross one another. Each unit cell is positioned proximally adjacent at least one other unit cell. Communicatively coupling between qubits is realized through respective intra-cell and inter-cell coupling devices.