Audio / Video

S-TI-S (Superconducting-Topological Insulator-Superconductor) Josephson Junction Networks

  • 01:09:37

Description

One of the proposed approaches to realize a quantum computer is to make use of exotic Majorana fermion modes that can exist in hybrid systems which intertwine superconductivity and topological order. The goal is to take advantage of the delocalization of quantum information and the non-Abelian statistics of the Majorana states to avoid dephasing and minimize error corrections in what is known as topologically-protected quantum computing. In this talk, I will describe a potential platform for nucleating and manipulating Majorana fermions in multiply-connected networks of lateral Josephson junctions fabricated by depositing superconductor electrodes onto the surface of topological insulators. In a magnetic field, Majorana fermions are localized in the cores of Josephson vortices at locations in the junction where the phase difference is an odd multiple of π, and they can be moved by applying fields, currents, and voltages to perform quantum operations. Electronic transport measurements on Nb-Bi2Se3-Nb devices exhibit anomalous features consistent with a 4π-periodic sin(φ/2)-component in the Josephson current-phase relation consistent with this picture. We are now exploring circuits for imaging, manipulating, and braiding these exotic excitations and developing schemes for reading out the parity of the Majorana pairs that encodes the quantum information.

Details

Title

S-TI-S (Superconducting-Topological Insulator-Superconductor) Josephson Junction Networks

Creator

University of California, Berkeley. Dept. of Physics

Published

Berkeley, CA, University of California, Berkeley, Dept. of Physics, October 22, 2018

Full Collection Name

Physics Colloquia

Type

Video

Format

Lecture.

Extent

1 streaming video file

Other Physical Details

digital, sd., col.

Archive

Physics Library

Note

Recorded at a colloquium held on October 22, 2018, sponsored by the Dept. of Physics, University of California, Berkeley.

originally produced as an .mts file in 2018

Speakers: Dale Van Harlingen.

Collection

Physics Colloquia

Tracks

colloquia/10-22-18Harlingen.mp4 01:09:37

Linked Resources

View record in Digital Collections.