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

L. Hofstetter, S. Csonka (), J. Nygård and C. Schönenberger ()
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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
J. Nygård: Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5
C. Schönenberger: University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Nature, 2009, vol. 461, issue 7266, 960-963

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.

Date: 2009
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DOI: 10.1038/nature08432

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