Full Synchronization of Arrays of High-Tc Josephson Junctions

Alexander M. Klushin⁽¹⁾, Ming He^(1,2) and Norbert Klein⁽¹⁾

(1) Institute for Bio- and Nanosystems and CNI-Centre of Nanoelectronic Systems for Information Technology Forschungszentrum Jülich GmbH, Jülich, Germany; e-mail:a.klushin@fz-juelich.de.
(2) Dept. of Electronics, Nankai Univ., Tianjin, People's Republic of China

Abstract - We explored high-temperature superconductor Josephson junction arrays embedded in a hemispherical Fabry-Perot resonator. We compared the characteristics of three designs of arrays to achieve steps at higher voltage with a better coupling to the millimeter wave irradiation power. With an optimal design, we achieved a maximum Josephson volt age of about 0.1V for an array of 620 bicrystal junctions at a temperature of 79.2K and a frequency of 77.465 GHz. Also steps from 0.01 V up to 0.1 V were observed. Our results showed that such circuits are promising for applications in quantum voltage metrology. It is important to note that our quasioptical coupling method can be extended up to terahertz frequencies.

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Manuscript received Sept. 27, 2007; accepted October 23, 2007. Reference No. ST10, Category 4