Half-integer charge injection by a Josephson junction without excess noise

F. Hassler, A. Grabsch, M.J. Pacholski, D.O. Oriekhov, O. Ovdat, Inanc Adagideli, C.W.J. Beenakker

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
58 Downloads (Pure)


A Josephson junction in a topological superconductor can inject a charge e/2 into a normal-metal contact, carried by chiral Majorana edge modes. Here, we address the question whether this half-integer charge is a sharp observable, without quantum fluctuations. Because the Majorana modes are gapless, they support charge fluctuations in equilibrium at zero temperature. But we find that the excess noise introduced out of equilibrium by the e/2 charge transfer vanishes. We discuss a strategy to reduce the equilibrium fluctuations, by means of a heavy-tailed time-dependent detection efficiency, to achieve a nearly noiseless half-integer charge transfer.
Original languageEnglish
Article number045431
Number of pages10
JournalPhysical Review B
Issue number4
Publication statusPublished - 30 Jul 2020


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