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VOLUME 60 (1994) | ISSUE 10 | PAGE 718
Coherent transport of single Cooper pairs in Josephson arrays
We investigate one-dimensional arrays of small Josephson junctions. The Josephson energy Bj is assumed to be small compared to the Coulomb energy EcThe dynamics of this system can be described in terms of quantum particles (Cooper pairs) propagating coherently through the array. By applying the voltages to the gates coupled capacitively to the electrodes of the junctions one can add Cooper pairs into the array one by one. By changing the gate voltages in time one can inject single Cooper pairs into the array. Injected Cooper pair propagates through the array as a wave packet. For a ring-shaped array pierced by a magnetic flux the critical current can be carried by one Cooper pair. The critical current may decrease with increasing number of Cooper pairs in the array.