We predict theoretically and observe in experiment that the differential conductance of a superconducting SET transistor exhibits a peak which is a complete analogue in a macroscopic system of a standard resonant tunneling peak associated with tunneling through a single quantum state. In particular, in a symmetric transistor, the peak height is universal and equal to e2 /2π¯h. Away from the resonance we clearly observe the co-tunneling current which in contrast to the normal-metal transistor varies linearly with the bias voltage. PACS numbers: 73.40.Gk, 74.50.+r Typeset using REVTEX 1 Charging effects in systems of small Josephson junctions are quite well understood by now – see, e.g., [1,2]. Interest, however, has been focused mostly on the interplay between the charging effects and Cooper pair transport, which can be described in generic terms as the quantum dynamics of the Josephson phase difference. The aim of this work is to study the quasiparticle transport in a superconducting SET transistor – a system of two junction
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