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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).

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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