Device for Connecting Qubits for a Semiconductor Spin Qubit Quantum Computer

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This patent describes a T-junction device for semiconductor spin qubit quantum computers, specifically designed to efficiently shuttle and route electronic or hole-based spin qubits within a quantum processor. It uses a system of specialized gate electrodes on a semiconductor structure to create controllable potential wells that can move qubits along defined paths and branches, including diverting them at junctions. The structure addresses fidelity and scalability challenges inherent in two-dimensional quantum architectures by allowing for precise movement and control of qubits between different operational zones (e.g., initialization, manipulation, readout).

Use CasesContent extracted from patent full text and abstract with AI.

• Routing and distributing qubits between operational zones (manipulation, readout, initialization) on a semiconductor spin-qubit quantum processor.
• Building scalable, grid-like quantum processor architectures that require high-density qubit routing solutions.
• Enabling high-fidelity movement (shuttling) and re-routing of qubits for executing complex quantum algorithms.
• Facilitating error correction and optimization techniques in quantum computing by dynamically re-routing qubits around defective areas.
• Implementing modular or configurable quantum processor layouts that require flexible qubit connectivity.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly improves scalability of spin qubit quantum processors by streamlining interconnections between qubits and logic zones.
• Enhances operation fidelity by allowing precise control over qubit movement and by enabling circumvention of defects or low-fidelity regions in the quantum chip.
• Reduces wiring complexity and spatial constraints compared to traditional approaches, supporting denser chip layouts.
• Supports both straight shuttling and turning operations (diverting qubits at junctions), making the quantum processor architecture more versatile.
• Facilitates implementation of advanced quantum algorithms by ensuring reliable qubit transfer and connectivity across the processor.

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Patent Abstract

A T-junction for a quantum processor comprises a plurality of gate electrodes arranged on a semiconductor heterostructure. The plurality of gate electrodes comprises first conveyor gates arranged at at least one path and second conveyor gates arranged at a branch. The branch and the at least one path are arranged substantially perpendicular to one another and meet at a junction. The first conveyor gates and second conveyor gates are configured to be supplied with at least one voltage V. The first conveyor gates and second conveyor gates are configured to move at least one qubit, arranged in the semiconductor heterostructure, along the at least one path and/or along the branch, and to divert the at least one qubit from the at least one path into the branch or from the branch into the at least one path.