Cooper pair splitting in a two-dimensional electron gas III: Flux-control

ORAL

Abstract

We study CPS in a three-terminal device implemented in an InSbAs two-dimensional electron gas. The device consists of two quantum dots coupled via a Josephson junction (JJ). The dots act as charge and energy filters and allow us to select between two non-local processes: CPS or elastic co-tunnelling (ECT). The junction is embedded in a superconducting loop, thus allowing us to control the phase difference across the JJ with an applied flux. Tuning the device in the CPS-only allowed regime, we demonstrate that the non-local current depends periodically on the flux through the loop. The periodicity is consistent with the flux-dependent modulation of the Andreev bound state (ABS) energy, extracted from tunnelling spectroscopy measurements. This work demonstrates that the CPS amplitude is directly linked to virtual processes mediated by ABSs. Moreover, such a device could be used a flux-controlled source of entangled electrons.

–

Presenters

  • Ivan Kulesh

    • QuTech (Delft University of Technology)
    • Delft University of Technology

Authors

  • Ivan Kulesh

    • QuTech (Delft University of Technology)
    • Delft University of Technology

  • Christian G Prosko

    • QuTech (Delft University of Technology)
    • Delft University of Technology

  • Qingzhen Wang

    • Delft University of Technology

  • Sebastiaan ten Haaf

    • Delft University of Technology

  • Candice Thomas

    • Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University,
    • Department of Physics and Astronomy and Birck Nanotechnology Center, Purdue University

  • Di Xiao

    • Department of Physics and Astronomy, Purdue University
    • Purdue University

  • Michael J Manfra

    • Purdue University, Microsoft Quantum Purdue
    • Purdue University
    • Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA; Microsoft Quantum Lab, Purdue University, West Lafayette, IN, USA
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Electrical and Computer Engineering and Microsoft Quantum Lab West Lafayette, Purdue University
    • Department of Physics and Astronomy and Nanotechnology Center Purdue University, Microsoft Quantum Lab West Lafayette
    • Department of Physics and Astronomy, Birck Nanotechnology Center, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University

  • Srijit Goswami

    • QuTech (Delft University of Technology)
    • Delft University of Technology