Method for calibrating and / or assisting in the design of a spin-qubit or two-level quantum system and quantum component

EP4494046A1Pending Publication Date: 2025-01-22C12 QUANTUM ELECTRONICS
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Patent Information

Application Number
EP2023712498
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-03-16
Filing Date
2023-03-16
Publication Date
2025-01-22

AI Technical Summary

Technical Problem

Current methods for designing and calibrating spin-photon qubits lack well-defined tunable parameters, leading to uncontrollable operating regimes and increased decoherence due to noise, making it difficult to achieve high fidelity and short gate times.

Method used

A method involving a double quantum dot system coupled to a microwave cavity using symmetrical and antisymmetrical magnetic fields, where the bias voltage is set to zero, and magnetic coupling constants are calculated and adjusted to minimize unwanted transitions, allowing for optimal spin-photon coupling and low noise operation.

Benefits of technology

This approach enables a qubit with improved reliability and reduced decoherence, achieving high fidelity and short gate times by maximizing spin-photon coupling while minimizing charge noise and error rates.

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Abstract

The invention relates to a method for calibrating a two-level spin quantum system coupled to a microwave cavity by a symmetric magnetic field and an antisymmetric magnetic field in the form of a double quantum dot comprising a left dot and a right dot, which system is subjected to a bias voltage, the method being characterised by the following steps: - setting the bias voltage (ε) to zero volts; - determining a wave function φp of each of the quantum dots; - calculating and / or setting the antisymmetric αas and symmetric αs magnetic coupling constants, calculating and / or setting the tunnel coupling constant, and / or the symmetric magnetic coupling constant αs and / or the antisymmetric magnetic coupling constant αas.
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