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A long-lived capacitively shunted flux qubit embedded in a 3D cavity
Applied Physics Letters ( IF 3.521 ) Pub Date : 2019-12-23 , DOI: 10.1063/1.5136262
Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida, Kousuke Kakuyanagi, Shiro Saito

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 range of 60–90 μs and a 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 and unwanted two-level-system defects, 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.
更新日期:2019-12-31

 

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