### Session W39: Superconductivity-Josephson Junctions and Qubits

2:30 PM–5:30 PM, Thursday, March 16, 2006
Baltimore Convention Center Room: 342

Chair: J. Robert Anderson, University of Maryland

Abstract ID: BAPS.2006.MAR.W39.9

### Abstract: W39.00009 : Crossover from single electron counting to Cooper pair counting

4:06 PM–4:18 PM

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#### Authors:

Tim Duty
Jonas Bylander
Per Delsing
(Microtechnolgy and Nanoscience, Chalmers University of Technology, Sweden)

We present experimental studies of charge transport in a one-dimensional array of Josephson junctions using a single charge counting device based upon a radio-frequency single-electron transistor$^1$. We observe a crossover from time-correlated tunneling of single electrons to Cooper pairs as a function of an applied magnetic field. At relatively high magnetic field, single electron transport dominates and the frequency is given by f=I/e. As the magnetic field is lowered the frequency gradually shifts to f=I/2e, indicating tunneling of Cooper pairs. $^1$Jonas Bylander, Tim Duty and Per Delsing, Nature 434 (2005) 285.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.W39.9