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

Hassler, F. and Grabsch, A. and Pacholski, M. J. and Oriekhov, D. O. and Ovdat, O. and Adagideli, İnanç and Beenakker, C. W. J. (2020) Half-integer charge injection by a Josephson junction without excess noise. Physical Review B, 102 (4). ISSN 2469-9950 (Print) 2469-9969 (Online)

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Abstract

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.
Item Type: Article
Subjects: Q Science > QC Physics
Q Science > QC Physics > QC176-176.9 Solids. Solid state physics
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: İnanç Adagideli
Date Deposited: 24 Sep 2020 12:25
Last Modified: 04 Aug 2023 14:51
URI: https://research.sabanciuniv.edu/id/eprint/41074

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