2D Spin Qubit Array Layout for Scalable Quantum Readout
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Solution Overview
Problem
Scaling quantum computers to a large number of qubits is challenging due to inefficiencies in die space utilization and limited interactions between qubits in linear arrays, particularly for those located far apart.
Innovation Solution
A two-dimensional array of qubits with single-electron transistors arranged above and below, allowing for interactions with nearby qubits, and a multi-layer interconnection stack for increased connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear array of qubits is used, then the structure is simple and easy to manufacture, but the die space utilization becomes inefficient and interactions between distant qubits are limited
Solution Approach 1:
The patent transitions from a one-dimensional linear array to a two-dimensional grid array of qubits. This dimensional change allows qubits to be arranged in rows and columns, improving die space utilization by packing qubits more efficiently on the chip surface while maintaining manageable connectivity through localized interactions with neighboring qubits in the grid structure.
2Device complexity
If a linear array of qubits is used, then the device complexity is low, but the interaction capability between distant qubits is limited
Solution Approach 1:
By organizing qubits in a two-dimensional grid rather than a linear array, the system enables qubits to interact with multiple neighbors in different directions (horizontal and vertical), thereby enhancing interaction capability and versatility without proportionally increasing device complexity.
Solution Approach 2:
The patent introduces separate control mechanisms for different qubit interactions, including dedicated control lines for horizontal and vertical neighbors, and distinct mechanisms for two-qubit gates versus measurement operations. This segmentation allows independent optimization of different interaction types while maintaining overall system manageability.
3Quantity of substance
If the number of qubits is increased, then the computational power is improved, but the initialization time increases
Solution Approach 1:
The patent divides the large-scale qubit array into smaller functional blocks or modules, each with its own initialization sequence. This segmentation allows parallel initialization of multiple blocks simultaneously, reducing the total initialization time compared to sequentially initializing a monolithic array of the same size.
Solution Approach 2:
The system performs preliminary preparation of qubit states and control line configurations before full operational initialization. By pre-establishing certain quantum states and control configurations, the system reduces the time required for complete system initialization when scaling to larger qubit numbers.
Data Source
AI summary
Technologies for two-dimensional spin qubit arrays are disclosed. In an illustrative embodiment, a quantum processor die includes a two-dimensional array of spin qubits. Single-electron transistors (SETs) are arranged near an upper and lower boundary around the two-dimensional array of spin qubits. Each SET may be positioned to be able to read, e.g., qubits from two rows, allowing for the state of four rows of qubits to be read by the SETs above and below the array of qubits. The two-dimensional array of spin qubits may allow for a large number of physical and logical qubits in communication with each other, allowing for large scale quantum computation.