Method of Operating a Semiconductor Spin Qubit Quantum Computer

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This patent describes a method for operating a semiconductor spin qubit quantum computer. The method is focused on optimizing the control and movement (shuttling) of individual quantum bits (qubits) within a processor using arrays of gate electrodes that create potential wells. It involves calibrating the voltages applied to these gates, measuring the fidelity of operations (such as moving or manipulating qubits), identifying locations where performance suffers, and adjusting the control voltages to maximize accuracy and minimize errors during quantum computations.

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

• Operating large-scale, semiconductor-based quantum computers with higher reliability.
• Quantum computing hardware development and debugging, especially for spin qubit platforms (like silicon or Si/SiGe quantum dots).
• Automated calibration and real-time tuning of quantum processors to maintain high-fidelity quantum operations.
• Manufacturing and quality assurance processes for quantum chips, identifying and compensating for defects or disorder in the semiconductor structure.
• Algorithm execution where dynamic qubit routing and manipulation with minimal errors are required, such as quantum error correction or complex quantum circuits.

BenefitsContent extracted from patent full text and abstract with AI.

• Increases the operational fidelity and reliability of quantum computers using semiconductor spin qubits, critical for practical quantum computing.
• Enables scalable quantum processor design by addressing the 'fan-out' control problem and mitigating spatial wiring constraints.
• Automatically identifies and compensates for defects or disorder in the semiconductor, improving yield and device lifetime.
• Reduces the effect of noise and environmental fluctuations, leading to more robust and repeatable operations.
• Allows for machine learning-assisted calibration and adjustment, minimizing manual intervention and optimizing performance with changing operational conditions.

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Patent Abstract

A method of operating a quantum processor (10) comprising a plurality of gate electrodes arranged on a semiconductor heterostructure, wherein the plurality of gate electrodes comprises conveyor gate electrodes configured to be supplied with at least one voltage V to move at least one qubit, arranged in the semiconductor heterostructure, along the at least one path to a manipulation zone for manipulating the at least one qubit is disclosed. The method comprises the steps of calibrating the at least one voltage V supplied to the gate electrodes; determining at least one fidelity FM or an error syndrome S, relating to manipulating the at least one qubit at the manipulation zone; and adjusting the at least one voltage V.