Schematic rendition of a Cooper-pair splitter. Leads connect superconductors (blue) to quantum dots (green) that are controlled by gate voltage.

From the article:

Interference and Switching of Josephson Current Carried by Nonlocal Spin-Entangled Electrons in a SQUID-Like System with Quantum Dots
Zhi Wang and Xiao Hu
Phys. Rev. Lett. 106, 037002 (2011)

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