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Superconducting Qubits

A long-lived capacitively shunted flux qubit embedded in a 3D cavity

arXiv

Authors: Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida, Kousuke Kakuyanagi, Shiro Saito

Year

2019

Paper ID

14879

Status

Preprint

Abstract Read

~2 min

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Abstract

We report the experimental realization of a 3D capacitively-shunt superconducting flux qubit with long coherence times. At the optimal flux bias point, the qubit demonstrates energy relaxation times in the 60-90 μs range, and Hahn-echo coherence time of about 80 μs which can be further improved by dynamical decoupling. Qubit energy relaxation can be attributed to quasiparticle tunneling, while qubit dephasing is caused by flux noise away from the optimal point. Our results show that 3D c-shunt flux qubits demonstrate improved performance over other types of flux qubits which is advantageous for applications such as quantum magnetometry and spin sensing.

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We report the experimental realization of a 3D capacitively-shunt superconducting flux qubit with long coherence times.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1911.04635 [2] arXiv https://arxiv.org/abs/1911.04635 [3] Publisher https://arxiv.org/abs/1911.04635

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