Super-Poissonian noise from quasiparticle poisoning in electron transport through a pair of Majorana bound states
Abstract
Topological qubits based on non-Abelian Majorana bound states (MBSs) are protected by parity which is challenged by quasiparticle poisoning (QPP). In this work, we show how QPP affects transport through a pair of coupled MBSs weakly connected to two current leads, using an open system approach and full counting statistics. We find that the correct low-energy physics requires one to include next to leading order tunneling events in the coupling to the leads. In particular, our results show that QPP causes super-Poissonian local shot noise with a Fano factor that diverges with decreasing bias voltage, while the current and the nonlocal (cross) noise are only little affected. We explain that these features are a direct consequence of the nature of MBSs being their own antiparticle making noise measurements a viable tool to search for MBSs in the presence of QPP.
Details
- External Organisation(s)
-
Lund University
Technische Universität Braunschweig
- Type
- Article
- Journal
- Physical Review B
- Volume
- 111
- Pages
- 1-6
- No. of pages
- 6
- ISSN
- 2469-9950
- Publication date
- 27.06.2025
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Electronic version(s)
-
https://doi.org/10.1103/m3gq-x86z (Access:
Open
)
https://link.aps.org/doi/10.1103/m3gq-x86z (Access: Unknown )
