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  • Letter
  • Open Access

Interference and parity blockade in transport through a Majorana box

Maximilian Nitsch1,*, Rubén Seoane Souto1,2,†, and Martin Leijnse1,2,‡

  • 1Division of Solid State Physics and NanoLund, Lund University, S-22100 Lund, Sweden
  • 2Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark

  • *maximilian.nitsch@ftf.lth.se
  • †ruben.seoane_souto@ftf.lth.se
  • ‡martin.leijnse@ftf.lth.se
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Phys. Rev. B 106, L201305 – Published 17 November, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L201305

Abstract

A Majorana box—two topological superconducting nanowires coupled via a trivial superconductor—is a building block in devices aiming to demonstrate non-Abelian physics, as well as for topological quantum computer architectures. We theoretically investigate charge transport through a Majorana box and show that current can be blocked when two Majoranas couple to the same lead, fixing their parity. In direct analogy to a Pauli spin blockade in spin qubits, this parity blockade can be used for fast and high-fidelity qubit initialization and readout, as well as for current-based measurements of decoherence times. Furthermore, we demonstrate that transport can distinguish between a clean Majorana box and a disordered box with additional unwanted Majorana or Andreev bound states.

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Outline

Information

Phys. Rev. B 106, L201305– Published 17 November, 2022
  • Received 25 May 2022
  • Revised 12 September 2022
  • Accepted 16 September 2022
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