Abstract

Macroscopic quantum tunneling (MQT) has been demonstrated recently in aBi2Sr2CaCu2O8+δ surface intrinsic Josephson junction (SIJJ) with its critical current densityJc below100 A cm−2 and itssize below 1 µm. In this work, we present a study of the switching currentdistributions of SIJJs fabricated on the same crystal, withJc>500 A cm−2 and size of0.8 and 1.6 µm. MQT is clearly observed, and the crossover from MQT to thermal activation(TA) is seen. Our analysis shows that the data agree well with the theoreticalpredictions of MQT and TA for different-sized SIJJs when parameters that roughlyscale with the SIJJ size are used. In the crossover regime, the data are foundto be better fitted by considering quantum corrections to TA. We discussthe realistic design of phase- and flux-type qubits using the experimentallyattainable SIJJ parameters, which shows that the SIJJs, with their controllableJc and size (or junction capacitance), are feasible for qubit applications in the future.

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