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Cooper pair splitting in parallel quantum dot Josephson junctions

Devices to generate on-demand non-local spin entangled electron pairs have potential application as solid-state analogues of the entangled photon sources used in quantum optics. Recently, Andreev entanglers that use two quantum dots as filters to adiabatically split and separate the quasi-particles...

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Autores principales: Deacon, R. S., Oiwa, A., Sailer, J., Baba, S., Kanai, Y., Shibata, K., Hirakawa, K., Tarucha, S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4506998/
https://www.ncbi.nlm.nih.gov/pubmed/26130172
http://dx.doi.org/10.1038/ncomms8446
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author Deacon, R. S.
Oiwa, A.
Sailer, J.
Baba, S.
Kanai, Y.
Shibata, K.
Hirakawa, K.
Tarucha, S.
author_facet Deacon, R. S.
Oiwa, A.
Sailer, J.
Baba, S.
Kanai, Y.
Shibata, K.
Hirakawa, K.
Tarucha, S.
author_sort Deacon, R. S.
collection PubMed
description Devices to generate on-demand non-local spin entangled electron pairs have potential application as solid-state analogues of the entangled photon sources used in quantum optics. Recently, Andreev entanglers that use two quantum dots as filters to adiabatically split and separate the quasi-particles of Cooper pairs have shown efficient splitting through measurements of the transport charge but the spin entanglement has not been directly confirmed. Here we report measurements on parallel quantum dot Josephson junction devices allowing a Josephson current to flow due to the adiabatic splitting and recombination of the Cooper pair between the dots. The evidence for this non-local transport is confirmed through study of the non-dissipative supercurrent while tuning independently the dots with local electrical gates. As the Josephson current arises only from processes that maintain the coherence, we can confirm that a current flows from the spatially separated entangled pair.
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spelling pubmed-45069982015-07-30 Cooper pair splitting in parallel quantum dot Josephson junctions Deacon, R. S. Oiwa, A. Sailer, J. Baba, S. Kanai, Y. Shibata, K. Hirakawa, K. Tarucha, S. Nat Commun Article Devices to generate on-demand non-local spin entangled electron pairs have potential application as solid-state analogues of the entangled photon sources used in quantum optics. Recently, Andreev entanglers that use two quantum dots as filters to adiabatically split and separate the quasi-particles of Cooper pairs have shown efficient splitting through measurements of the transport charge but the spin entanglement has not been directly confirmed. Here we report measurements on parallel quantum dot Josephson junction devices allowing a Josephson current to flow due to the adiabatic splitting and recombination of the Cooper pair between the dots. The evidence for this non-local transport is confirmed through study of the non-dissipative supercurrent while tuning independently the dots with local electrical gates. As the Josephson current arises only from processes that maintain the coherence, we can confirm that a current flows from the spatially separated entangled pair. Nature Pub. Group 2015-07-01 /pmc/articles/PMC4506998/ /pubmed/26130172 http://dx.doi.org/10.1038/ncomms8446 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Deacon, R. S.
Oiwa, A.
Sailer, J.
Baba, S.
Kanai, Y.
Shibata, K.
Hirakawa, K.
Tarucha, S.
Cooper pair splitting in parallel quantum dot Josephson junctions
title Cooper pair splitting in parallel quantum dot Josephson junctions
title_full Cooper pair splitting in parallel quantum dot Josephson junctions
title_fullStr Cooper pair splitting in parallel quantum dot Josephson junctions
title_full_unstemmed Cooper pair splitting in parallel quantum dot Josephson junctions
title_short Cooper pair splitting in parallel quantum dot Josephson junctions
title_sort cooper pair splitting in parallel quantum dot josephson junctions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4506998/
https://www.ncbi.nlm.nih.gov/pubmed/26130172
http://dx.doi.org/10.1038/ncomms8446
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