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Voltage- and temperature-controllable quantum-data processing across three-terminal superconducting nanodevices

Applied Nanoscience volume 10, pages 2781–2789 (2020)Cite this article

Abstract

Quantum entanglement is among the main fundamental resources for quantum information processing tasks like quantum communication, quantum computation, etc. The states with such kind of a nonlocal correlation can easily be obtained from a single-mode wave packet using a passive linear beam splitter. Taking into account scalable arguments and thus the need to implement quantum technologies in a solid-state platform, we study transmission of quantum data encoded in quasiparticles charges across a nanoscale three-arm beam splitter made by different BCS superconducting wires with a node size less than the smallest coherence length. It is calculated as to how a quasiparticle wave packet injected into one of the device leads is divided between two others. We show that an appropriate choice of the incoming wave packet permits to control the ratio of the two outgoing charges by comparatively small voltages of the order of the superconducting energy gap. The response of the device is analyzed as a function of the applied voltage biases and an asymmetry parameter, the ratio of the energy gaps in the two outward leads. We discuss two possible ways of the coherent wave-packet injection, specific pulses of voltages at ultra-low temperatures and those of current biases at temperatures comparable with the critical temperature of a superconducting emitter. Finally, we argue that voltages applied to outward leads as well as the temperature of an inward lead can serve as a control parameter for the charges delivered within a quantum network.

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Acknowledgements

M. Belogolovskii is deeply grateful to the German Academic Exchange Service (DAAD) for the support of his stay at the Friedrich-Schiller University Jena. The work has been partly supported by the joint German-Ukrainian project “Controllable quantum-information transfer in superconducting networks” (DFG Project Number SE 664/21) and by the Fundamental Research Programme funded by the MES of Ukraine (Project No. 0117U002360).

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Affiliations

  1. G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Academician Vernadsky Blvd. 36, Kiev, 03142, Ukraine

    Mikhail Belogolovskii

  2. Vasyl’ Stus Donetsk National University, 600-richya Str. 21, Vinnytsia, 21021, Ukraine

    Mikhail Belogolovskii & Elena Zhitlukhina

  3. O.O. Galkin Donetsk Institute for Physics and Engineering, National Academy of Sciences of Ukraine, Nauki Ave. 46, Kiev, 03028, Ukraine

    Elena Zhitlukhina

  4. Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Helmholtzweg 5, 07743, Jena, Germany

    Mikhail Belogolovskii & Paul Seidel

Authors
  1. Mikhail Belogolovskii
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  2. Elena Zhitlukhina
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  3. Paul Seidel
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Correspondence to Mikhail Belogolovskii.

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Belogolovskii, M., Zhitlukhina, E. & Seidel, P. Voltage- and temperature-controllable quantum-data processing across three-terminal superconducting nanodevices. Appl Nanosci 10, 2781–2789 (2020). https://doi.org/10.1007/s13204-019-01117-y

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  • DOI: https://doi.org/10.1007/s13204-019-01117-y

Keywords

  • Superconducting nanoscale beam-splitter
  • Quantum charge transport
  • Wave packets
  • Voltage and temperature control