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Escapemeasurements on DC-Squids with small junctions: Macroscopic quantum tunneling, thermal activation and phase diffusion

Jani M. Kivioja, Tommi Nieminen, Jukka P Pekola, Julien Claudon, O. Buisson

Published Jan 1, 2004• 0 citations
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Diwen wuli xuebao•Jan 1, 2015•0 citations
Josephson junction is the key element of the superconducting quantum bits.DC superconducting quantum interference device(DC-SQUID)plays a important role in the measurement of superconducting flux quantum bit because of its high sensitivity in magnetic field probe.By evaporating aluminum from slanted angles and the method of static oxidization,we fabricated the DC-SQUID sample composed by two parallel tunnel junctions Al/Al2O3/Al.Placing the sample in different temperature between 20 mK and 1000 mK,we had the measurement of switching current distribution(SCD).The transition from macroscopic quantum tunneling mechanism(MQT)to thermal activation(TA)is clearly observed in 50 mK.When the temperature is higher than 80 mK,the phase diffusion phenomenon(PD)is observed.It is of great importance for the research of phase dynamics of tunnel junction.