N. Hatakenaka et H. Ezaki, Squeezing of Josephson phases in d.c. superconducting quantum interferencedevices, J PHYS CH S, 59(10-12), 1998, pp. 2062-2064
We theoretically study the two-mode squeezing of Josephson phases in d.c, s
uperconducting interference devices. The non-linearity of phase interaction
s required for the squeezing is mediated by the external electromagnetic fi
elds. Since the squeezing is one quantum aspect based on the Heisenberg unc
ertainty relation, the Josephson phase squeezing provides another scheme fo
r investigating the quantum nature of macroscopic objects. The squeezing of
the Josephson phases can be observed by detecting the quantum fluctuation
of the supercurrent through the Josephson current-phase relation. (C) 1998
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