Tunable resonator-resonator coupling circuit and quantum computing apparatus comprising thereof

The tunable resonator-resonator coupling circuit with ungrounded superconducting islands and capacitive couplings addresses idling frequency issues, enhancing quantum computing performance by reducing decoherence and noise sensitivity, thus improving computational accuracy and speed.

CA3226458CActive Publication Date: 2026-09-22IQM FINLAND OY
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Patent Information

Application Number
CA3226458
Authority / Receiving Office
CA · CA
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-07-21
Publication Date
2026-09-22
Estimated Expiration
2041-07-21

AI Technical Summary

Technical Problem

Existing tunable coupler setups in quantum computing circuits suffer from idling frequencies above qubit frequencies, leading to reduced operation speed and accuracy, decoherence issues, and interference with readout resonators, particularly when using transmon qubits.

Method used

A tunable resonator-resonator coupling circuit with ungrounded superconducting islands and capacitive couplings is introduced, allowing for controlled interaction between resonators with idling frequencies below qubit frequencies, reducing decoherence and enhancing operational efficiency.

Benefits of technology

The proposed circuit design improves computational accuracy and processing speed by minimizing gate errors and resonance interference, while being less sensitive to noise and more flexible in operation.

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Abstract

The invention is generally related to the field of quantum computing and particularly to a tunable resonator resonator coupling circuit that provides both direct and indirect couplings between linear or nonlinear resonators. The indirect coupling is provided by using a tunable coupling element that comprises two ungrounded superconducting islands. Since the superconducting islands are ungrounded, it is possible to provide different signs of coupling frequencies for the resonators and the superconducting islands, which in turn allows the interaction between the first and second resonators to be controlled more efficiently. Moreover, the design, calibration, and operation of the circuit with such a tunable coupling element are significantly easier and simpler compared to the existing analogues, while providing the same or even better performance. A quantum computing apparatus using one or more such circuits is also provided.
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