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Caption: This figure shows the Josephson tunnel (left) and coherent quantum phase slip (right). At left, two superconductors are separated by thin insulator (in this case space). A current is produced by superconducting electron pairs tunneling across the insulator. At right, two insulators are separated by superconductor. A current is produced by magnetic flux tunneling across the superconductor.
Credit: RIKEN
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Related news release: A new kind of quantum junction
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