Cooper pair splitting in parallel quantum dot Josephson junctions

R. S. Deacon (), A. Oiwa, J. Sailer, S. Baba, Y. Kanai, K. Shibata, K. Hirakawa and S. Tarucha
Additional contact information
R. S. Deacon: Advanced Device Laboratory, RIKEN
A. Oiwa: The Institute of Scientific and Industrial Research, Osaka University 8-1 Mihogaoka
J. Sailer: The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
S. Baba: The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Y. Kanai: The Institute of Scientific and Industrial Research, Osaka University 8-1 Mihogaoka
K. Shibata: Institute of Industrial Science, The University of Tokyo
K. Hirakawa: Institute of Industrial Science, The University of Tokyo
S. Tarucha: Center for Emergent Matter Science (CEMS), RIKEN

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms8446

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