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A subnanosecond clock cryogenic system for Josephson computers

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10 Author(s)
Kotani, S. ; Fujitsu Lab. Ltd., Atsugi, Japan ; Inoue, A. ; Suzuki, H. ; Hasuo, S.
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Using Josephson chips maintained at 4.4 K by a closed-cycle 3-W desk-size refrigerator, the authors verified the correct operation of a 4-b Josephson microprocessor up to 1.1 GHz. Room temperature and liquid He temperature regions are connected with a 130-ps delay using I/O cables passing through sidewalls of a vacuum vessel. It is proposed that both semiconductor and Josephson devices can coexist on circuit boards that constitute the equivalent of a single board.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:1 ,  Issue: 4 )