Quantum Processor Unit Cell Layout for Diagonal Qubit Coupling
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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, as they primarily allow for horizontal and vertical inter-cell interactions but not diagonal interactions.
Innovation Solution
A quantum processor architecture is designed with qubits arranged in a multi-layered integrated circuit, where qubits in each unit cell are positioned adjacent to each other in a way that allows for both intra-cell and inter-cell communicative coupling, including diagonal interactions, using a combination of intra-cell and inter-cell coupling devices to enhance connectivity between qubits in adjacent unit cells.
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 complexity is reduced and manufacturing is simplified, but the problem-solving capability and connectivity are restricted
Solution Approach 1:
The quantum processor is divided into multiple unit cells, each containing a specific arrangement of qubits and coupling devices. This segmentation allows the system to maintain manageable complexity at the unit cell level while achieving enhanced overall connectivity through inter-cell interactions, including diagonal connections between adjacent unit cells
Solution Approach 2:
The patent introduces diagonal inter-cell interactions in addition to horizontal and vertical connections, effectively adding a new dimension of connectivity. This allows qubits in adjacent unit cells to interact not only through orthogonal directions but also through diagonal pathways, significantly enhancing the problem-solving capability without proportionally increasing device complexity
2Adaptability or versatility
If more coupling devices are added to increase inter-cell qubit interconnections, then the connectivity and problem-embedding capability are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The coupling devices are designed to serve multiple functions: they enable both intra-cell qubit coupling and inter-cell qubit coupling, including diagonal interactions. This multi-functionality allows the system to achieve enhanced connectivity without adding proportionally more coupling devices, thereby maintaining manufacturing feasibility while improving qubit connectivity
Solution Approach 2:
The patent merges the functions of intra-cell and inter-cell coupling devices into a unified architecture where adjacent unit cells share coupling mechanisms. This merging allows diagonal interactions to be implemented using the same coupling device technology as orthogonal interactions, avoiding the need for entirely new device types and simplifying the manufacturing process
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.