Observation of the 4π-periodic Josephson effect in indium arsenide nanowires

Dominique Laroche, Daniël Bouman, David J. Woerkom, Alex Proutski, Chaitanya Murthy, Dmitry I. Pikulin, Chetan Nayak, Ruben J. J. Gulik, Jesper Nygård, Peter Krogstrup, Leo P. Kouwenhoven and Attila Geresdi ()
Additional contact information
Dominique Laroche: Delft University of Technology
Daniël Bouman: Delft University of Technology
David J. Woerkom: Delft University of Technology
Alex Proutski: Delft University of Technology
Chaitanya Murthy: University of California
Dmitry I. Pikulin: Microsoft Research
Chetan Nayak: University of California
Ruben J. J. Gulik: Delft University of Technology
Jesper Nygård: University of Copenhagen
Peter Krogstrup: University of Copenhagen
Leo P. Kouwenhoven: Delft University of Technology
Attila Geresdi: Delft University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Quantum computation by non-Abelian Majorana zero modes (MZMs) offers an approach to achieve fault tolerance by encoding quantum information in the non-local charge parity states of semiconductor nanowire networks in the topological superconductor regime. Thus far, experimental studies of MZMs chiefly relied on single electron tunneling measurements, which lead to the decoherence of the quantum information stored in the MZM. As a next step towards topological quantum computation, charge parity conserving experiments based on the Josephson effect are required, which can also help exclude suggested non-topological origins of the zero bias conductance anomaly. Here we report the direct measurement of the Josephson radiation frequency in indium arsenide nanowires with epitaxial aluminium shells. We observe the 4π-periodic Josephson effect above a magnetic field of ≈200 mT, consistent with the estimated and measured topological phase transition of similar devices.

Date: 2019
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DOI: 10.1038/s41467-018-08161-2

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