A subnanosecond clock cryogenic system for Josephson computers

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 si...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1991-12, Vol.1 (4), p.164-169
Main Authors: Kotani, S., Inoue, A., Suzuki, H., Hasuo, S., Takenouchi, T., Fukase, K., Miyagawa, F., Yoshida, S., Sano, T., Kamioka, Y.
Format: Article
Language:English
Subjects:
Cables
Clocks
Cryogenics
Delay
Helium
Microprocessors
Printed circuits
Refrigeration
Superconducting devices
Temperature
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Summary: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.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.107401