Coherent control of a few-channel hole type gatemon qubit

• URL: http://arxiv.org/abs/2312.06411v1
• Date: Mon, 11 Dec 2023 14:33:31 GMT
• Title: Coherent control of a few-channel hole type gatemon qubit
• Authors: Han Zheng, Luk Yi Cheung, Nikunj Sangwan, Artem Kononov, Roy Haller, Joost Ridderbos, Carlo Ciaccia, Jann Hinnerk Ungerer, Ang Li, Erik P.A.M. Bakkers, Andreas Baumgartner, Christian Sch\"onenberger
• Abstract summary: Gatemon qubits are the electrically tunable cousins of superconducting transmon qubits. In this work, we demonstrate the full coherent control of a gatemon qubit based on hole carriers in a Ge/Si core/shell nanowire.
• Score: 7.283679827070781
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Gatemon qubits are the electrically tunable cousins of superconducting transmon qubits. In this work, we demonstrate the full coherent control of a gatemon qubit based on hole carriers in a Ge/Si core/shell nanowire, with the longest coherence times in group IV material gatemons to date. The key to these results is a high-quality Josephson junction obtained in a straightforward and reproducible annealing technique. We demonstrate that the transport through the narrow junctions is dominated by only two quantum channels, with transparencies up to unity. This novel qubit platform holds great promise for quantum information applications, not only because it incorporates technologically relevant materials, but also because it provides new opportunities, like an ultrastrong spin-orbit coupling in the few-channel regime of Josephson junctions.

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