Transmission phase read-out of a large quantum dot in a nanowire interferometer

Francesco Borsoi, Kun Zuo, Sasa Gazibegovic, Roy L. M. Op het Veld, Erik P. A. M. Bakkers, Leo P. Kouwenhoven and Sebastian Heedt ()
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Francesco Borsoi: Delft University of Technology
Kun Zuo: RIKEN Center for Emergent Matter Science (CEMS)
Sasa Gazibegovic: Eindhoven University of Technology
Roy L. M. Op het Veld: Eindhoven University of Technology
Erik P. A. M. Bakkers: Eindhoven University of Technology
Leo P. Kouwenhoven: Delft University of Technology
Sebastian Heedt: Delft University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Detecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport. Crucially, interferometry will enable the read-out of topological qubits based on one-dimensional nanowires. However, measuring the transmission phase of a quantum dot in a nanowire has not yet been established. Here, we exploit recent breakthroughs in the growth of one-dimensional networks and demonstrate interferometric read-out in a nanowire-based architecture. In our two-path interferometer, we define a quantum dot in one branch and use the other path as a reference arm. We observe Fano resonances stemming from the interference between electrons that travel through the reference arm and undergo resonant tunnelling in the quantum dot. Between consecutive Fano peaks, the transmission phase exhibits phase lapses that are affected by the presence of multiple trajectories in the interferometer. These results provide critical insights for the design of future topological qubits.

Date: 2020
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DOI: 10.1038/s41467-020-17461-5

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