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Lifetime of Majorana qubits in Rashba nanowires with nonuniform chemical potential

Aseev, Pavel P. and Klinovaja, Jelena and Loss, Daniel. (2018) Lifetime of Majorana qubits in Rashba nanowires with nonuniform chemical potential. Physical review B: Condensed matter and materials physics, 98 (15). p. 155414.

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Official URL: https://edoc.unibas.ch/67787/

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Abstract

We study the lifetime of topological qubits based on Majorana bound states hosted in a one-dimensional Rashba nanowire (NW) with proximity-induced superconductivity and nonuniform chemical potential needed for manipulation and readout. If nearby gates tune the chemical potential locally so that part of the NW is in the trivial phase, Andreev bound states (ABSs) can emerge which are localized at the interface between topological and trivial phases with energies significantly less than the gap. The emergence of such subgap states decreases the Majorana qubit lifetime at finite temperatures due to local perturbations that can excite the system into these ABSs. Using the Keldysh formalism, we study such excitations caused by fluctuating charges in capacitively coupled gates and calculate the corresponding Majorana lifetimes due to thermal noise, which are shown to be reduced in comparison with those in NWs with uniform chemical potential.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:1098-0121
e-ISSN:1550-235X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:06 Feb 2019 13:36
Deposited On:06 Feb 2019 13:36

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