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Cooper pair splitting in parallel quantum dot Josephson junctions

Author

Listed:
  • R. S. Deacon

    (Advanced Device Laboratory, RIKEN
    Center for Emergent Matter Science (CEMS), 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
    INQIE, The University of Tokyo)

  • K. Hirakawa

    (Institute of Industrial Science, The University of Tokyo
    INQIE, The University of Tokyo
    JST CREST, 4-1-8 Hon-cho, Kawaguchi-shi)

  • S. Tarucha

    (Center for Emergent Matter Science (CEMS), RIKEN
    The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
    INQIE, The University of Tokyo
    QPEC, The University of Tokyo)

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.

Suggested Citation

  • R. S. Deacon & A. Oiwa & J. Sailer & S. Baba & Y. Kanai & K. Shibata & K. Hirakawa & S. Tarucha, 2015. "Cooper pair splitting in parallel quantum dot Josephson junctions," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8446
    DOI: 10.1038/ncomms8446
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    Cited by:

    1. Sadashige Matsuo & Takaya Imoto & Tomohiro Yokoyama & Yosuke Sato & Tyler Lindemann & Sergei Gronin & Geoffrey C. Gardner & Sho Nakosai & Yukio Tanaka & Michael J. Manfra & Seigo Tarucha, 2023. "Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Antti Ranni & Fredrik Brange & Elsa T. Mannila & Christian Flindt & Ville F. Maisi, 2021. "Real-time observation of Cooper pair splitting showing strong non-local correlations," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    3. Qingzhen Wang & Sebastiaan L. D. Haaf & Ivan Kulesh & Di Xiao & Candice Thomas & Michael J. Manfra & Srijit Goswami, 2023. "Triplet correlations in Cooper pair splitters realized in a two-dimensional electron gas," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    4. Bhupendra Kumar & Sachin Verma & Tanuj Chamoli & Ajay, 2023. "Josephson transport across T-shaped and series-configured double quantum dots system at infinite- $$\textit{U}$$ U limit," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 96(12), pages 1-13, December.

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