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Flux-tunable hybridization in a double quantum dot interferometer

Journal Article (2024)
Author(s)

Christian G. Prosko (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Ivan Kulesh (TU Delft - QRD/Goswami Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)

Michael Chan (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

Lin Han (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Di Xiao (Purdue University)

Candice Thomas (Purdue University)

Michael J. Manfra (Purdue University)

Srijit Goswami (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft)

Filip K. Malinowski (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Research Group
QRD/Kouwenhoven Lab
DOI related publication
https://doi.org/10.21468/SciPostPhys.17.3.074 Final published version
More Info
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Publication Year
2024
Language
English
Research Group
QRD/Kouwenhoven Lab
Issue number
3
Volume number
17
Article number
074
Downloads counter
349
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Abstract

Quantum interference of electron tunneling occurs in any system where multiple tunneling paths connect states. This unavoidably arises in two-dimensional semiconducting qubit arrays, and must be controlled as a prerequisite for the manipulation and readout of hybrid topological and parity qubits. Studying a loop formed by two quantum dots, we demonstrate a magnetic-flux-tunable hybridization between two electronic levels, an irreducibly simple system where quantum interference is expected to occur. Using radio-frequency reflectometry of the dots’ gate electrodes we extract an interdot coupling exhibiting oscillations with a periodicity of one flux quantum. In different tunneling regimes we benchmark the oscillations’ contrast, and find their amplitude varies with the charge state of the quantum dots. These results establish the feasibility and limitations of parity readout of qubits with tunnel couplings tuned by flux.