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arXiv · 1805.00594

Feedback control of persistent-current oscillation based on the atomic-clock technique

Deshui Yu·Rainer Dumke
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Abstract

We propose a scheme of stabilizing the persistent-current Rabi oscillation based on the flux qubit-resonator-atom hybrid structure. The LC resonator weakly interacts with the flux qubit and maps the persistent-current Rabi oscillation onto the intraresonator electric field. This field is further coupled to a Rydberg-Rydberg transition of the $^{87}$Rb atom. The Rabi-frequency fluctuation of the flux qubit is deduced from measuring the atomic population and stabilized via feedback controlling the external flux bias. Our numerical simulation indicates that the feedback-control method can efficiently suppress the background fluctuations in the flux qubit, especially in the low-frequency limit. This technique may be extensively applicable to different types of superconducting circuits, paving a new way to long-term-coherence superconducting quantum information processing.

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Deshui Yu, Rainer Dumke. 2018-05-02. Feedback control of persistent-current oscillation based on the atomic-clock technique. https://doi.org/10.1103/physreva.97.053813

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