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Nonlocal quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime

Amitai, Ehud and Tiwari, Rakesh P. and Walter, Stefan and Schmidt, Thomas L. and Nigg, Simon E.. (2016) Nonlocal quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime. Physical Review B, 93 (7). 075421.

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Official URL: http://edoc.unibas.ch/52056/

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Abstract

A Cooper pair splitter consists of two quantum dots side-coupled to a conventional superconductor. Usually, the quantum dots are assumed to have a large charging energy compared to the superconducting gap, in order to suppress processes other than the coherent splitting of Cooper pairs. In this work, in contrast, we investigate the limit in which the charging energy is smaller than the superconducting gap. This allows us, in particular, to study the effect of a Zeeman field comparable to the charging energy. We find analytically that in this parameter regime the superconductor mediates an interdot tunneling term with a spin symmetry determined by the Zeeman field. Together with electrostatically tunable quantum dots, we show that this makes it possible to engineer a spin triplet state shared between the quantum dots. Compared to previous works, we thus extend the capabilities of the Cooper pair splitter to create entangled nonlocal electron pairs.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Tiwari, Rakesh and Amitai, Ehud and Nigg, Simon
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9950
e-ISSN:2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:15 Feb 2017 08:32
Deposited On:15 Feb 2017 08:28

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