Resonant Cooper pair tunneling through a double-island qubit.
We have measured transport in the Coulomb blockade regime through a quantum system consisting of two superconducting islands coupled by a Josephson junction. The double island is weakly connected to leads by small superconducting tunnel junctions. At low bias voltages, a new resonant transport process for Cooper pairs is observed. The results show that Cooper pair transport can be used as a probe of the macroscopic energy levels of the double island.
Bibow
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Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, BP 166, F-38042 Grenoble Cedex 9, France.
Lafarge
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Lévy
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