A gate tunable transmon qubit in planar Ge

Sagi O, Crippa A, Valentini M, Janik M, Baghumyan L, Fabris G, Kapoor L, Hassani F, Fink JM, Calcaterra S, Chrastina D, Isella G, Katsaros G. A gate tunable transmon qubit in planar Ge. arXiv, 2403.16774.

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Abstract
Gate-tunable transmons (gatemons) employing semiconductor Josephson junctions have recently emerged as building blocks for hybrid quantum circuits. In this study, we present a gatemon fabricated in planar Germanium. We induce superconductivity in a two-dimensional hole gas by evaporating aluminum atop a thin spacer, which separates the superconductor from the Ge quantum well. The Josephson junction is then integrated into an Xmon circuit and capacitively coupled to a transmission line resonator. We showcase the qubit tunability in a broad frequency range with resonator and two-tone spectroscopy. Time-domain characterizations reveal energy relaxation and coherence times up to 75 ns. Our results, combined with the recent advances in the spin qubit field, pave the way towards novel hybrid and protected qubits in a group IV, CMOS-compatible material.
Publishing Year
Date Published
2024-03-26
Journal Title
arXiv
Acknowledgement
We acknowledge Lucas Casparis, Jeroen Danon, Valla Fatemi, Morten Kjaergard and Javad Shabani for their valuable insights and comments. This research was supported by the Scientific Service Units of ISTA through resources provided by the MIBA Machine Shop and the Nanofabrication facility. This research and related results were made possible with the support of the NOMIS Foundation and the FWF Projects with DOI:10.55776/I5060 and DOI:10.55776/P36507. We also acknowledge the NextGenerationEU PRIN project 2022A8CJP3 (GAMESQUAD) for partial financial support.
Article Number
2403.16774
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Sagi O, Crippa A, Valentini M, et al. A gate tunable transmon qubit in planar Ge. arXiv. doi:10.48550/arXiv.2403.16774
Sagi, O., Crippa, A., Valentini, M., Janik, M., Baghumyan, L., Fabris, G., … Katsaros, G. (n.d.). A gate tunable transmon qubit in planar Ge. arXiv. https://doi.org/10.48550/arXiv.2403.16774
Sagi, Oliver, Alessandro Crippa, Marco Valentini, Marian Janik, Levon Baghumyan, Giorgio Fabris, Lucky Kapoor, et al. “A Gate Tunable Transmon Qubit in Planar Ge.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2403.16774.
O. Sagi et al., “A gate tunable transmon qubit in planar Ge,” arXiv. .
Sagi O, Crippa A, Valentini M, Janik M, Baghumyan L, Fabris G, Kapoor L, Hassani F, Fink JM, Calcaterra S, Chrastina D, Isella G, Katsaros G. A gate tunable transmon qubit in planar Ge. arXiv, 2403.16774.
Sagi, Oliver, et al. “A Gate Tunable Transmon Qubit in Planar Ge.” ArXiv, 2403.16774, doi:10.48550/arXiv.2403.16774.
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