dc.contributor.author
Mishmash, Ryan V.
dc.contributor.author
Bauer, Bela
dc.contributor.author
Oppen, Felix von
dc.contributor.author
Alicea, Jason
dc.date.accessioned
2020-03-03T12:24:57Z
dc.date.available
2020-03-03T12:24:57Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/26819
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-26577
dc.description.abstract
Topological quantum computation encodes quantum information nonlocally by nucleating non-Abelian anyons separated by distances L, typically spanning the qubit device size. This nonlocality renders topological qubits exponentially immune to dephasing from all sources of classical noise with operator support local on the scale of L. We perform detailed analytical and numerical analyses of a time-domain Ramsey-type protocol for noisy Majorana-based qubits that is designed to validate this coveted topological protection in near-term devices such as the so-called “tetron” design. By assessing dependence of dephasing times on tunable parameters, e.g., magnetic field, our proposed protocol can clearly distinguish a bona fide Majorana qubit from one constructed from semilocal Andreev bound states, which can otherwise closely mimic the true topological scenario in local probes. In addition, we analyze leakage of the qubit out of its low-energy manifold due to classical-noise-induced generation of quasiparticle excitations; leakage limits the qubit lifetime when the bulk gap collapses, and hence our protocol further reveals the onset of a topological phase transition. This experiment requires measurement of two nearby Majorana modes for both initialization and readout—achievable, for example, by tunnel coupling to a nearby quantum dot—but no further Majorana manipulations, and thus constitutes an enticing prebraiding experiment. Along the way, we address conceptual subtleties encountered when discussing dephasing and leakage in the context of Majorana qubits.
en
dc.format.extent
23 Seiten
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject
Majorana bound states
en
dc.subject
quantum information with solid state qubits
en
dc.subject
topological quantum computing
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::530 Physik
dc.title
Dephasing and leakage dynamics of noisy Majorana-based qubits: Topological versus Andreev
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
075404
dcterms.bibliographicCitation.doi
10.1103/PhysRevB.101.075404
dcterms.bibliographicCitation.journaltitle
Physical review
dcterms.bibliographicCitation.number
7
dcterms.bibliographicCitation.volume
101
dcterms.bibliographicCitation.url
https://doi.org/10.1103/PhysRevB.101.075404
refubium.affiliation
Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
2469-9950
dcterms.isPartOf.eissn
2469-9969