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Electrical detection of the Majorana fusion rule for chiral edge vortices in a topological superconductor

by C. W. J. Beenakker, A. Grabsch, Y. Herasymenko

Submission summary

As Contributors: Carlo Beenakker · AurĂ©lien Grabsch · Yaroslav Herasymenko
Arxiv Link:
Date submitted: 2018-12-05
Submitted by: Beenakker, Carlo
Submitted to: SciPost Physics
Domain(s): Theoretical
Subject area: Quantum Physics


Majorana zero-modes bound to vortices in a topological superconductor have a non-Abelian exchange statistics expressed by a non-deterministic fusion rule: When two vortices merge they may or they may not produce an unpaired fermion with equal probability. Building on a recent proposal to inject edge vortices in a chiral mode by means of a Josephson junction, we show how the fusion rule manifests itself in an electrical measurement. A $2\pi$ phase shift at a pair of Josephson junctions creates a topological qubit in a state of even-even fermion parity, which is transformed by the chiral motion of the edge vortices into an equal-weight superposition of even-even and odd-odd fermion parity. Fusion of the edge vortices at a second pair of Josephson junctions results in a correlated charge transfer of zero or one electron per cycle, such that the current at each junction exhibits shot noise, but the difference of the currents is nearly noiseless.

Current status:
Editor-in-charge assigned

Submission & Refereeing History

Submission 1812.01444v1 (5 December 2018)

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