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

By Tobias Bautze, Christoph Süssmeier, Shintaro Takada, Christoph Groth, Tristan Meunier, Michihisa Yamamoto, Seigo Tarucha, Xavier Waintal and Christopher Bäuerle


10 pages, 13 figuresInternational audienceWe 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 new 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 to reproduce detailed features of the transport measurements such as in-phase and anti-phase 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 magneto conductance oscillations in both conductance and visibility between simulations and experiments within a specific parameter range

Topics: [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: 'American Physical Society (APS)'
Year: 2014
DOI identifier: 10.1103/PhysRevB.89.125432
OAI identifier: oai:HAL:hal-00993947v1
Provided by: HAL-CEA
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