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Cooper pair splitter realized in a two-quantum-dot Y-junction

Author

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  • L. Hofstetter

    (University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland)

  • S. Csonka

    (University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
    Budapest University of Technology and Economics, Budafoki u. 6, 1111 Budapest, Hungary)

  • J. Nygård

    (Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5)

  • C. Schönenberger

    (University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland)

Abstract

Electron entanglement: splitting pairs One of the most counterintuitive aspects of quantum mechanics is non-locality, manifesting as spatially separated objects influencing each other in a direct way. Experimental verifications of such concepts have been conducted successfully using entangled pairs of photons to test so-called Bell inequalities, but similar demonstrations using electrons have remained elusive owing to the inherent difficulty of creating and splitting pairs of entangled electrons. Lukas Hofstetter and colleagues now demonstrate that this is possible in a Y-shaped electron entangler consisting of a superconductor at its stem, coupled via tunnelling barriers to two separate quantum dots along the fork-like branches of the device. The entangled pairs of electrons are naturally formed in the superconductor, which in its ground state consists of Cooper pairs of electrons, and split by Coulomb interactions and careful tuning of the energy levels of the quantum dots. The study paves the way for the study of electronic entanglement and experimental tests of Bell inequalities in the solid state.

Suggested Citation

  • L. Hofstetter & S. Csonka & J. Nygård & C. Schönenberger, 2009. "Cooper pair splitter realized in a two-quantum-dot Y-junction," Nature, Nature, vol. 461(7266), pages 960-963, October.
    • Handle: RePEc:nat:nature:v:461:y:2009:i:7266:d:10.1038_nature08432
    DOI: 10.1038/nature08432
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    Cited by:

    1. Dāgs Olšteins & Gunjan Nagda & Damon J. Carrad & Daria V. Beznasyuk & Christian E. N. Petersen & Sara Martí-Sánchez & Jordi Arbiol & Thomas S. Jespersen, 2023. "Cryogenic multiplexing using selective area grown nanowires," Nature Communications, Nature, vol. 14(1), pages 1-7, 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.
    3. 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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