Abstract

We discuss for the single Cooper pair box the contributions to relaxation and to decoherenee of the electromagnetic environment, of the offset charg enoise, and of a measuring Single Electron Transistor. We show that a single Cooper pair transistor can also be used for that purpose. Experimentally, we have operated such a device by measuring the variations of its critical supercurrent with the gate voltage using a SQUID series array amplifier. We describe the characteristics of this new electrometer and compare different schemes for measuring the critical current.

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