Qubit Array Layout for Deadlock-Free Two-Qubit Operations
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Solution Overview
Problem
In silicon electronic quantum computers, the increasing number of qubits poses spatial constraints that make it difficult to implement large numbers of qubits due to the need for individual control lines, leading to unexpected calculation results and potential deadlocks in qubit operations, especially when performing two-qubit operations.
Innovation Solution
The implementation of a qubit movement operation that allows electrons to be spatially moved to adjacent quantum dots, utilizing a bus area, aisle area, and seat area configuration in the qubit array, enabling efficient qubit placement and operation while avoiding deadlocks by restricting electron movement based on channel connections and occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual control lines are arranged for each qubit, then each qubit can be controlled independently, but the number of control lines increases with the number of qubits, making it extremely difficult to implement large numbers of qubits due to spatial constraints
Solution Approach 1:
The patent merges control functionality by implementing shared control lines that can control multiple qubits simultaneously. The control line is configured to apply control signals to multiple qubits in a group, reducing the total number of control lines required while maintaining independent control capability through selective signal activation.
Solution Approach 2:
The control line is designed with multi-functional capability to serve multiple qubits. A single control line can selectively control different qubits based on the applied voltage signal, allowing the same control line to perform multiple control functions across different qubit groups at different time intervals.
2Device complexity
If a common control line is used to control multiple qubits simultaneously, then the number of control lines is reduced, but the same arithmetic operation is performed on unrelated qubits, leading to unexpected different calculation results
Solution Approach 1:
The patent implements dynamic control where the control line's target qubits change over time based on applied voltage signals. By dynamically adjusting which qubits are controlled at different time intervals, the system can selectively operate on specific qubits while leaving others unaffected, preventing unintended operations on unrelated qubits.
Solution Approach 2:
The control line operates with periodic action by applying control signals in time intervals. Different qubits are controlled during different time periods, allowing the same control line to sequentially control multiple qubit groups without simultaneous interference, thus maintaining calculation accuracy while reducing control line count.
3Shape
If qubits are arranged in a fixed array with limited adjacent positions, then the structure is simple, but it becomes difficult to place required qubits adjacent to each other for two-qubit operations when using a large number of qubits
Solution Approach 1:
The patent introduces a time dimension to the qubit array structure by implementing qubit movement operations. Qubits can be relocated to different positions in the array over time, allowing the system to adaptively place required qubits adjacent to each other for two-qubit operations while maintaining a simple fixed physical array structure.
Solution Approach 2:
The qubit positions are made dynamic through movement operations that allow electrons to be transferred between quantum dots. This enables the system to reconfigure which qubits are adjacent to each other based on operational requirements, providing flexibility for two-qubit operations while maintaining a simple fixed array structure.
Data Source
AI summary
The technology provided by the present invention makes it possible to obtain desired calculation results efficiently while appropriately avoiding a deadlock in qubit operations performed in a situation where a large number of qubits are arranged. An electron configuration device formed by a quantum computer includes a bus area, an aisle area, and a seat area in a qubit array. In an environment where the seat area and the bus area are connected by the aisle area, the electron configuration device is configured such that a first qubit initially arranged in a predetermined seat area reaches the bus area through the aisle area connected to the seat area and moves through the bus area to a position adjacent to a second qubit to be operated on.