Article (Scientific journals)
Non local quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime
Amitai, Ehud; Tiwari, Rakesh; Walter, Stefan et al.
2015In Physical Review. B, 93, p. 075421
Peer reviewed
 

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Abstract :
[en] 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 inter-dot 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 non local electron pairs.
Disciplines :
Physics
Author, co-author :
Amitai, Ehud;  University of Basel
Tiwari, Rakesh;  University of Basel
Walter, Stefan;  University Erlangen-Nurnberg
Schmidt, Thomas ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Nigg, Simon;  University of Basel
External co-authors :
yes
Language :
English
Title :
Non local quantum state engineering with the Cooper pair splitter beyond the Coulomb blockade regime
Publication date :
December 2015
Journal title :
Physical Review. B
Publisher :
American Physical Society
Volume :
93
Pages :
075421
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 04 February 2016

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