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Showing 1–12 of 12 results
Advanced filters: Author: Georgios Katsaros Clear advanced filters

  • Germanium’s electronic structure and large, tunable spin-orbit coupling makes it a good material for constructing hole-based quantum devices. Here the authors demonstrate the fabrication and two-axis control of a hole spin qubit in a germanium double quantum dot.

    • Hannes Watzinger
    • Josip Kukučka
    • Georgios Katsaros
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-6

  • Hole spin qubits benefit from large spin-orbit interaction for efficient manipulation, but this can result in qubit variability. Here the authors study anisotropies in microwave-driven singlet-triplet qubits in planar germanium, revealing two distinct operating regimes due to different quantization axes alignments.

    • Jaime Saez-Mollejo
    • Daniel Jirovec
    • Georgios Katsaros
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • M. Valentini et al. study superconducting quantum interference devices (SQUIDs) where the weak link of the Josephson junctions is a germanium 2D hole gas. They report signatures of the tunneling of pairs of Cooper pairs. For a particular microwave drive power, they observe a 100% efficient superconducting diode effect.

    • Marco Valentini
    • Oliver Sagi
    • Georgios Katsaros
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-10

  • Valentini et al. devise a method through which they can perform both tunnelling spectroscopy and Coulomb blockade spectroscopy on the same hybrid nanowire island to reduce ambiguities in the detection of Majorana.

    • Marco Valentini
    • Maksim Borovkov
    • Georgios Katsaros
    Research
    Nature
    Volume: 612, P: 442-447

  • A singlet-triplet spin qubit using holes in a Ge quantum well is demonstrated, and can be operated at low magnetic fields of a few millitesla.

    • Daniel Jirovec
    • Andrea Hofmann
    • Georgios Katsaros
    Research
    Nature Materials
    Volume: 20, P: 1106-1112

  • Recently, disordered or granular superconductors have gained attention for their applications in quantum devices. Here the authors report a reproducible method to fabricate high-impedance granular Al resonators, followed by integration with quantum dot devices, achieving record hole-photon coupling strength.

    • Marián Janík
    • Kevin Roux
    • Georgios Katsaros
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-9

  • A gatemon is a transmon-type superconducting qubit made using a hybrid superconductor-semiconductor approach enabling tunability with electric gates. Here the authors demonstrate a gatemon qubit in planar germanium, which is anticipated to have various advantages.

    • Oliver Sagi
    • Alessandro Crippa
    • Georgios Katsaros
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-8

  • Germanium is a promising material to build quantum components for scalable quantum information processing. This Review examines progress in materials science and devices that has enabled key building blocks for germanium quantum technology, such as hole-spin qubits and superconductor–semiconductor hybrids.

    • Giordano Scappucci
    • Christoph Kloeffel
    • Menno Veldhorst
    Reviews
    Nature Reviews Materials
    Volume: 6, P: 926-943