Andreev molecules in semiconductor nanowire double quantum dots

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Su, Zhaoen and Tacla, Alexandre B. and Hocevar, Moïra and Car, Diana and Plissard, Sébastien R. and Bakkers, Erik P. A. M. and Daley, Andrew J. and Pekker, David and Frolov, Sergey M. (2017) Andreev molecules in semiconductor nanowire double quantum dots. Nature Communications, 8. 585. ISSN 2041-1723 (https://doi.org/10.1038/s41467-017-00665-7)

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Abstract

Quantum simulation is a way to study unexplored Hamiltonians by mapping them onto the assemblies of well-understood quantum systems 1 such as ultracold atoms in optical lattices 2 , trapped ions 3 or superconducting circuits 4 . Semiconductor nanostructures which form the backbone of classical computing hold largely untapped potential for quantum simulation 5–7. In particular, chains of quantum dots in semiconductor nanowires can be used to emulate one-dimensional Hamiltonians such as the toy model of a topological p-wave superconductor 8–11 . Here we realize a building block of this model, a double quantum dot with superconducting 1 contacts, in an indium antimonide nanowire 12 . In each dot, tunnel-coupling to a superconductor induces Andreev bound states 13–19 . We demonstrate that these states hybridize to form the double-dot Andreev molecular states. We establish the parity and the spin structure of Andreev molecular levels by monitoring their evolution in electrostatic potential and magnetic field. Understanding Andreev molecules is a key step towards building longer chains which are predicted to generate Majorana bound states at the end sites 20, 21 . Two supercon ducting quantum dots are already sufficient to test the fusion rules of Majorana bound states, a milestone towards fault-tolerant topological quantum computing.

ORCID iDs

Su, Zhaoen, Tacla, Alexandre B. ORCID logoORCID: https://orcid.org/0000-0003-0738-8151, Hocevar, Moïra, Car, Diana, Plissard, Sébastien R., Bakkers, Erik P. A. M., Daley, Andrew J. ORCID logoORCID: https://orcid.org/0000-0001-9005-7761, Pekker, David and Frolov, Sergey M.;
  • Item type:Article
    ID code:61629
    Dates:
    Date
    Event
    17 September 2017
    Published
    19 July 2017
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:24 Aug 2017 16:15
    Last modified:15 Dec 2024 01:24
    URI:https://strathprints.strath.ac.uk/id/eprint/61629
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