Engineering superconducting qubits to reduce quasiparticles and charge noise

Xianchuang Pan, Yuxuan Zhou, Haolan Yuan, Lifu Nie, Weiwei Wei, Libo Zhang, Jian Li, Song Liu, Zhi Hao Jiang, Gianluigi Catelani (), Ling Hu (), Fei Yan () and Dapeng Yu
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Xianchuang Pan: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Yuxuan Zhou: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Haolan Yuan: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Lifu Nie: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Weiwei Wei: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Libo Zhang: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Jian Li: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Song Liu: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Zhi Hao Jiang: State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University
Gianluigi Catelani: JARA Institute for Quantum Information (PGI-11), Forschungszentrum Jülich
Ling Hu: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Fei Yan: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology
Dapeng Yu: Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Identifying, quantifying, and suppressing decoherence mechanisms in qubits are important steps towards the goal of engineering a quantum computer or simulator. Superconducting circuits offer flexibility in qubit design; however, their performance is adversely affected by quasiparticles (broken Cooper pairs). Developing a quasiparticle mitigation strategy compatible with scalable, high-coherence devices is therefore highly desirable. Here we experimentally demonstrate how to control quasiparticle generation by downsizing the qubit, capping it with a metallic cover, and equipping it with suitable quasiparticle traps. Using a flip-chip design, we shape the electromagnetic environment of the qubit above the superconducting gap, inhibiting quasiparticle poisoning. Our findings support the hypothesis that quasiparticle generation is dominated by the breaking of Cooper pairs at the junction, as a result of photon absorption by the antenna-like qubit structure. We achieve record low charge-parity switching rate (

Date: 2022
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DOI: 10.1038/s41467-022-34727-2

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