Journal of the Korean Physical Society

, Volume 62, Issue 10, pp 1558–1563 | Cite as

Engineering and manipulating topological qubits in 1D quantum wires

  • Panagiotis Kotetes
  • Gerd Schön
  • Alexander Shnirman
Article
  • 98 Downloads

Abstract

We investigate the Josephson effect in TNT and NTN junctions, consisting of topological (T) and normal (N) phases of semiconductor-superconductor 1D heterostructures in the presence of a Zeeman field. A key feature of our setup is that, in addition to the variation of the phase of the superconducting order parameter, we allow the orientation of the magnetic field to change along the junction. We find a novel magnetic contribution to the Majorana Josephson coupling that permits the Josephson current to be tuned by changing the orientation of the magnetic field along the junction. We also predict that a spin current can be generated by a finite superconducting phase difference, rendering these materials potential candidates for spintronic applications. Finally, this new type of coupling not only constitutes a unique fingerprint for the existence of Majorana bound states but also provides an alternative pathway for manipulating and braiding topological qubits in networks of wires.

Keywords

Quantum wires Majorana bound states Josephson effect Quantum computing 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Panagiotis Kotetes
    • 1
  • Gerd Schön
    • 1
  • Alexander Shnirman
    • 2
  1. 1.Institut für Theoretische FestkörperphysikKarlsruhe Institute of TechnologyKarlsruheGermany
  2. 2.Institut für Theorie der Kondensierten MaterieKarlsruhe Institute of TechnologyKarlsruheGermany

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