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

Anindya Das, Yuval Ronen, Moty Heiblum (), Diana Mahalu, Andrey V Kretinin and Hadas Shtrikman
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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

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2169

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