Nuclear state preparation via Landau-Zener-Stückelberg transitions in double quantum dots
| dc.contributor.author | Ribeiro, Hugo | |
| dc.contributor.author | Burkard, Guido | |
| dc.date.accessioned | 2011-03-24T17:52:51Z | deu |
| dc.date.available | 2011-03-24T17:52:51Z | deu |
| dc.date.issued | 2009 | deu |
| dc.description.abstract | We theoretically model a nuclear-state preparation scheme that increases the coherence time of a two-spin qubit in a double quantum dot. The two-electron system is tuned repeatedly across a singlet-triplet level-anticrossing with alternating slow and rapid sweeps of an external bias voltage. Using a Landau-Zener-St¨uckelberg model, we find that in addition to a small nuclear polarization that weakly affects the electron spin coherence, the slow sweeps are only partially adiabatic and lead to a weak nuclear spin measurement and a nuclear-state narrowing which prolongs the electron spin coherence. This resolves some open problems brought up by a recent experiment. Based on our description of the weak measurement, we simulate a system with up to n = 200 nuclear spins per dot. Scaling in n indicates a stronger effect for larger n. | eng |
| dc.description.version | published | |
| dc.format.mimetype | application/pdf | deu |
| dc.identifier.arxiv | 0811.3560v2 | deu |
| dc.identifier.doi | 10.1103/PhysRevLett.102.216802 | |
| dc.identifier.ppn | 313144753 | deu |
| dc.identifier.uri | http://kops.uni-konstanz.de/handle/123456789/9014 | |
| dc.language.iso | eng | deu |
| dc.legacy.dateIssued | 2009 | deu |
| dc.rights | terms-of-use | deu |
| dc.rights.uri | https://rightsstatements.org/page/InC/1.0/ | deu |
| dc.subject.ddc | 530 | deu |
| dc.title | Nuclear state preparation via Landau-Zener-Stückelberg transitions in double quantum dots | eng |
| dc.type | PREPRINT | deu |
| dspace.entity.type | Publication | |
| kops.citation.bibtex | @unpublished{Ribeiro2009Nucle-9014,
year={2009},
doi={10.1103/PhysRevLett.102.216802},
title={Nuclear state preparation via Landau-Zener-Stückelberg transitions in double quantum dots},
author={Ribeiro, Hugo and Burkard, Guido},
note={Also publ. in: Physical Review Letters ; 102 (2009), 21. - 216802}
} | |
| kops.citation.iso690 | RIBEIRO, Hugo, Guido BURKARD, 2009. Nuclear state preparation via Landau-Zener-Stückelberg transitions in double quantum dots | deu |
| kops.citation.iso690 | RIBEIRO, Hugo, Guido BURKARD, 2009. Nuclear state preparation via Landau-Zener-Stückelberg transitions in double quantum dots | eng |
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<dcterms:abstract xml:lang="eng">We theoretically model a nuclear-state preparation scheme that increases the coherence time of a two-spin qubit in a double quantum dot. The two-electron system is tuned repeatedly across a singlet-triplet level-anticrossing with alternating slow and rapid sweeps of an external bias voltage. Using a Landau-Zener-St¨uckelberg model, we find that in addition to a small nuclear polarization that weakly affects the electron spin coherence, the slow sweeps are only partially adiabatic and lead to a weak nuclear spin measurement and a nuclear-state narrowing which prolongs the electron spin coherence. This resolves some open problems brought up by a recent experiment. Based on our description of the weak measurement, we simulate a system with up to n = 200 nuclear spins per dot. Scaling in n indicates a stronger effect for larger n.</dcterms:abstract>
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| kops.description.comment | Also publ. in: Physical Review Letters ; 102 (2009), 21. - 216802 | eng |
| kops.description.openAccess | openaccessgreen | |
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| kops.identifier.nbn | urn:nbn:de:bsz:352-opus-91024 | deu |
| kops.opus.id | 9102 | deu |
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