Abstract
A novel current-injection Josephson latch with a single-flux quantum memory is experimentally verified. The experimental latch is fabricated by 5-μm Pb-alloy technology and occupies an area of 270×175 μm2, achieving one order of magnitude area reduction compared to magnetically coupled latch. In low-frequency experiments, the proper operation of a single latch under arbitrary input conditions and the proper data transfer from latch to latch are observed. In high-speed experiments, the proper operation of a single latch with cycle time down to 3.7 ns is observed, which is limited by the high-speed restriction of the test instruments at room temperature. These results show the possibility that the complete current injection logic system can be constructed by combining the present latch and current-injection logic gates.
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