cQED with grAl resonators and hole spins in germanium

ORAL

Abstract

Hole spins enable fast and all-electric control [1], due to strong intrinsic spin-orbit interaction (SOI). Since the SOI also couples spins to the electric field of a photon in a microwave resonator, strong hole-spin-photon coupling is expected. Recent experiment with holes in silicon indeed confirms this prediction [2], with the coupling largely exceeding the best figures reported with electrons [3, 4].

Here we report on hole double quantum dots (DQD) hosted in Ge/SiGe heterostructure coupled to a granular aluminum (grAl) resonator. grAl offers high kinetic inductance, magnetic field resilience and compatibility with multilayer lift-off based fabrication [5]. Assessing these properties, we demonstrate a resonator with a characteristic impedance of Z0 ~ 13 k?, due to the large kinetic inductance of Lkin ~ 2 nH/sq, resilient to out-of-plane magnetic fields exceeding Bperp ~ 280 mT with κ/2π < 5 MHz, well suited for spin-photon coupling experiments. We will also present our recent results of integrating these resonators with germanium DQDs in a cQED architecture, which aims for long-range coupling of hole spin qubits.



[1] Scappucci, G. et al. Nat. Rev. Mater. 6, 926-943 (2021).

[2] Yu, C. X. et al. arXiv:2206.14082 (2022).

[3] Mi, X. et al. Science 355, 156-158 (2017).

[4] Harvey-Collard, P. et al. Phys. Rev. X 12, 021026 (2022).

[5] Grünhaupt, L. et al. Nat. Mater. 18, 816-819 (2019).

*FWF; NOMIS Foundation; TOPSQUAD

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Presenters

  • Marián Janík

    • Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria

Authors

  • Marián Janík

    • Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria

  • Carla Nataly Borja Espinosa

    • Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria

  • Oliver Sagi

    • Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria
    • IST Austria

  • Andrea Ballabio

    • L-NESS, Physics Department, Politecnico di Milano
    • Politecnico di Milano
    • L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy
    • L-NESS, Physics Department, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
    • L-NESS, Politecnico di Milano

  • Pasquale Scarlino

    • EPFL
    • Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
    • Ecole Polytechnique Fédérale de Lausanne

  • Ioan M Pop

    • IQMT and PHI, Karlsruhe Institute of Technology, Germany
    • IQMT and PHI, Karlsruhe Institute of Technology (KIT)
    • IQMT and PHI, Karlsruhe Institute of Technology (KIT), Germany
    • Karlsruhe Institute of Technology (KIT)
    • IQMT and PHI, Karlsruhe Institute of Technology
    • Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

  • Daniel Chrastina

    • L-NESS, Physics Department, Politecnico di Milano
    • Politecnico di Milano
    • L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy
    • L-NESS, Physics Department, Politecnico di Milano, via Anzani 42, 22100, Como, Italy
    • L-NESS, Politecnico di Milano

  • Giovanni Isella

    • L-NESS, Physics Department, Politecnico di Milano
    • Politecnico di Milano
    • L-NESS, Physics Department, Politecnico di Milano, 22100 Como, Italy
    • L-NESS, Politecnico di Milano

  • Georgios Katsaros

    • Institute of Science and Technology Austria
    • IST Austria
    • Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria
    • Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria