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Fabrication of QFP devices from Au/SrTiO/sub 3//YBa/sub 2/Cu/sub 3/O/sub 7/ structures

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4 Author(s)
H. Hasegawa ; Adv. Res. Lab., Hitachi Ltd., Tokyo, Japan ; Y. Tarutani ; T. Fukazawa ; K. Takagi

Quantum Flux Parametron (QFP) devices were fabricated from Au/SrTiO/sub 3//YBa/sub 2/Cu/sub 3/O/sub 7/ structures based on bicrystal grain boundary junctions. The junction connected to a load inductor in series was utilized as a sampling gate which reads out the load current. External fluxes were applied to two closed loops separately in the QFP by using two independent activation lines in order to reduce the load inductance. A multiplexer consisting of a couple of the QFPs and the sampling junction was fabricated and was tested at 6.5 K.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:9 ,  Issue: 2 )