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- Title
Hole-type superconducting gatemon qubit based on Ge/Si core/shell nanowires.
- Authors
Zhuo, Enna; Lyu, Zhaozheng; Sun, Xiaopei; Li, Ang; Li, Bing; Ji, Zhongqing; Fan, Jie; Bakkers, E.P.A.M.; Han, Xiaodong; Song, Xiaohui; Qu, Fanming; Liu, Guangtong; Shen, Jie; Lu, Li
- Abstract
We demonstrate that superconducting gatemon qubits based on superconductor-semiconductor-superconductor Josephson junctions can be constructed on hole-type Ge/Si core/shell nanowires. The frequency of the qubit can be set firstly by controlling the diffusion of Al in the nanowire via thermal annealing, which yields a suitable critical supercurrent allowing the qubit frequency to be within the experimentally accessible range, and then by fine tuning of a gate voltage, by which an accurate adjustment of the frequency can be realized. On the resulted qubit, Rabi oscillation with an energy relaxation time T 1 ~ 180 ns was observed in the time domain, an average decoherence time T 2 * ~ 15 ns was obtained, and the gate voltage dependence of both T 1 and T 2 * was investigated. Such a hole-type superconducting gatemon qubit, based on materials with strong spin-orbit coupling and potentially the absence of hyperfine interaction after isotope purification, could be used for exploring the quantum coherence phenomena of hole-gas and even Majorana physics in Ge-based quantum devices.
- Subjects
NANOWIRES; SILICON nanowires; QUANTUM coherence; SPIN-orbit interactions; JOSEPHSON junctions; RABI oscillations; QUANTUM theory
- Publication
NPJ Quantum Information, 2023, Vol 9, Issue 1, p1
- ISSN
2056-6387
- Publication type
Article
- DOI
10.1038/s41534-023-00721-9