Year: 2019
Type: article
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 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.
Source: Applied Physics Letters
DOI: 10.1063/1.5136262
Authors: Leonid V. Abdurakhimov, Imran Mahboob, Hiraku Toida, Kousuke Kakuyanagi, Shiro Saito
Institutions: NTT (Japan), NTT Basic Research Laboratories
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: G7241486304
OpenAlex ID: W2989437652