Ballistic Majorana nanowire devices

Ö. Gül

Research output: ThesisDissertation (TU Delft)

21 Downloads (Pure)

Abstract

The dissertation reports a series of electron transport experiments on semiconductor nanowires towards realizing the hypothesized topological quantum computation. A topological quantum computer manipulates information that is stored nonlocally in the topology of a physical system. Such an operation possesses advantages over the current quantum computation platforms due to its robustness against local sources of decoherence, offering a natural fault-tolerance. Among various candidate platforms to realize topological quantum computation, semiconductor nanowires with strong spin-orbit coupling attached to conventional superconductors have emerged as a prime contender. The predicted topological properties of such a system is associated with the emergence of Majorana modes.

The presence of disorder has been considered to be the main obstacle towards the realization of a topological quantum computer based on semiconductor nanowires. Disorder can mimic the experimentally measurable properties of Majoranas, or can render the promise of fault-tolerance ineffective. The experiments in the dissertation aim for eliminating the disorder on the surface of the nanowire, and in the interface between the nanowire and the superconductor. Following a series of investigations demonstrating materials improvements, ballistic Majorana nanowire devices are realized.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Kouwenhoven, L.P., Supervisor
  • Bakkers, Erik, Supervisor
Award date18 Oct 2017
Print ISBNs987-90-8593-313-7
DOIs
Publication statusPublished - 2017

Bibliographical note

Casimir PhD Series, Delft-Leiden 2017-29

Keywords

  • topological states
  • topological quantum computation
  • topological superconductivity
  • Majorana
  • semiconductor nanowire
  • InSb

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