2017/12/31 by Dominique Laroche, Daniël Bouman, David J. van Woerkom +9 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con
paper · pdf · doi:10.1038/s41467-018-08161-2
published as Nature Communications 10, 245 (2019) · Published version. Supplementary Information is available as ancillary file, raw data and calculations can be downloaded from http://dx.doi.org/10.4121/uuid:1f936840-5bc2-40ca-8c32-1797c12cacb1
arxiv created 2020/03/04 · arxiv updated 2020/03/05
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 leads to 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 InAs nanowires with epitaxial aluminium shells. For the first time, 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.