A gate tunable transmon qubit in planar Ge
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913459177783296 |
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| author | Sagi, Oliver Crippa, Alessandro Valentini, Marco Janik, Marian Baghumyan, Levon Fabris, Giorgio Kapoor, Lucky Hassani, Farid Fink, Johannes Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Katsaros, Georgios |
| author_facet | Sagi, Oliver Crippa, Alessandro Valentini, Marco Janik, Marian Baghumyan, Levon Fabris, Giorgio Kapoor, Lucky Hassani, Farid Fink, Johannes Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Katsaros, Georgios |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_16774 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A gate tunable transmon qubit in planar Ge Sagi, Oliver Crippa, Alessandro Valentini, Marco Janik, Marian Baghumyan, Levon Fabris, Giorgio Kapoor, Lucky Hassani, Farid Fink, Johannes Calcaterra, Stefano Chrastina, Daniel Isella, Giovanni Katsaros, Georgios Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | A gate tunable transmon qubit in planar Ge |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2403.16774 |