Resonant Cooper Pair Tunneling through a Double-Island Qubit
E. Bibow, P. Lafarge, Laurent-Patrick Lévy
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.
Physical Review Letters•Dec 17, 2001•27 citations