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High-efficiency Cooper pair splitting demonstrated by two-particle conductance resonance and positive noise cross-correlation

Author

Listed:
  • Anindya Das

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • Yuval Ronen

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • Moty Heiblum

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • Diana Mahalu

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • Andrey V Kretinin

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • Hadas Shtrikman

    (Braun Center for Submicron Research, Weizmann Institute of Science)

Abstract

Entanglement is at the heart of the Einstein-Podolsky-Rosen paradox, where the non-locality is a necessary ingredient. Cooper pairs in superconductors can be split adiabatically, thus forming entangled electrons. Here, we fabricate such an electron splitter by contacting an aluminium superconductor strip at the centre of a suspended InAs nanowire. The nanowire is terminated at both ends with two normal metallic drains. Dividing each half of the nanowire by a gate-induced Coulomb blockaded quantum dot strongly impeds the flow of Cooper pairs due to the large charging energy, while still permitting passage of single electrons. We provide conclusive evidence of extremely high efficiency Cooper pair splitting via observing positive two-particle correlations of the conductance and the shot noise of the split electrons in the two opposite drains of the nanowire. Moreover, the actual charge of the injected quasiparticles is verified by shot noise measurements.

Suggested Citation

  • Anindya Das & Yuval Ronen & Moty Heiblum & Diana Mahalu & Andrey V Kretinin & Hadas Shtrikman, 2012. "High-efficiency Cooper pair splitting demonstrated by two-particle conductance resonance and positive noise cross-correlation," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2169
    DOI: 10.1038/ncomms2169
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    Cited by:

    1. 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.
    2. 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.

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