Timescales for charge transfer based operations on Majorana systems

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

In this Rapid Communication we analyze the efficiency of operations based on transferring charge from a quantum dot (QD) to two coupled topological superconductors, which can be used for performing non-Abelian operations on Majorana bound states (MBSs). We develop a method which allows us to describe the full time evolution of the system as the QD energy is manipulated. Using a full counting statistics analysis, we set bounds to the operation timescales. The lower bound depends on the superconducting phase difference due to a partial decoupling of the different MBS parity sectors, while the upper bound is set by the tunneling of quasiparticles to the MBSs. Using realistic parameters, we find the existence of a regime where the operation can be carried out with a fidelity close to unity. Finally, we propose the use of a two-operation protocol to quantify the effect of the dephasing and accumulated dynamical phases, demonstrating their absence for certain superconducting phase differences.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Copenhagen
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Telekommunikation
  • Den kondenserade materiens fysik
  • Atom- och molekylfysik och optik
Originalspråkengelska
Artikelnummer081407
TidskriftPhysical Review B - Condensed Matter and Materials Physics
StatusPublished - 2020
PublikationskategoriForskning
Peer review utfördJa