Abstract
Josephson junction of high-Tc cuprate superconductor is studied in terms of (1) basic characteristics of junction to improve the IcRN product, and (2) a new candidate for quantum bits. Aiming to fabricate phase qubits, the switching current distribution of intrinsic Josephson junctions in Bi2Sr2CaCu2Oy was investigated. The switching current distribution down to 40 K was consistent with the thermally activated escape process in the single junction, while a more complex feature appeared below 40 K, strongly suggesting the importance of the multi-junction effects.
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