Theoretical, numerical, and experimental study of a flying gubit electronic interferometer

We discuss an electronic interferometer recently measured by Yamamoto et al. This "flying quantum bit" experiment showed quantum oscillations between electronic trajectories of two tunnel-coupled wires connected via an Aharanov-Bohm ring. We present a simple scattering model as well as a n...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-03, Vol.89 (12)
Main Authors: Bautze, Tobias, Sussmeier, Christoph, Takada, Shintaro, Groth, Christoph, Meunier, Tristan, Yamamoto, Michihisa, Tarucha, Seigo, Waintal, Xavier, Bauerle, Christopher
Format: Article
Language:English
Subjects:
Computer simulation
Condensed matter
Electronics
Flight
Flying
Interferometers
Mathematical models
Oscillations
Qubits (quantum computing)
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Summary:We discuss an electronic interferometer recently measured by Yamamoto et al. This "flying quantum bit" experiment showed quantum oscillations between electronic trajectories of two tunnel-coupled wires connected via an Aharanov-Bohm ring. We present a simple scattering model as well as a numerical microscopic model to describe this experiment. In addition, we present experimental data to which we confront our numerical results. While our analytical model provides basic concepts for designing the flying qubit device, we find that our numerical simulations allow us to reproduce detailed features of the transport measurements such as in-phase and antiphase oscillations of the two output currents as well as a smooth phase shift when sweeping a side gate. Furthermore, we find remarkable resemblance for the magnetoconductance oscillations in both conductance and visibility between simulations and experiments within a specific parameter range.
ISSN:1098-0121
1550-235X