Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 68: Transport: Majorana Fermions

TT 68.2: Vortrag

Donnerstag, 10. März 2016, 10:45–11:00, H19

Gate-controlled preparation, manipulation, and readout of Majorana bound states in nanowire networks — •Michael Hell — Division of Solid State Physics and NanoLund, Lund University, Box. 118, S-22100, Lund, Sweden — Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark

We present a scheme for the preparation, manipulation, and readout of Majorana zero modes in mesoscopic islands in superconducting nanowires [1]. The key ingredient is to reversibly lock the fermion parity of the islands (stemming from the Majorana modes) to their charge state. This is achieved by gate control over Josephson junctions, complementing earlier proposals based on magnetic flux control, and allows experimental tools from quantum-dot experiments to be applied. Based on recent experimental progress, a sequence of milestones interpolating between zero-mode detection and quantum computing might be realized in the near future, including (1) detection of fusion rules for non-Abelian anyons using either proximal charge sensors or pumped current; (2) validation of a prototype Majorana qubit; and (3) demonstration of non-Abelian statistics. Experiments (1) and (2) can be performed already in a single-wire geometry, while experiment (3) requires branched nanowire structures.
D. Aasen, M. Hell, R. V. Mishmash, A. Higginbotham, J. Danon,

M. Leijnse, T. S. Jespersen, J. A. Folk, C. M. Marcus, K. Flensberg,

and J. Alicea, arXiv:1511.05153]