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Quantum interference filters based on oxide superconductor junctions for microwave applications

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Abstract

We have studied superconducting quantum interference filters (SQIFs) based on bicrystal neodymium gallate substrates, which can be used in the microwave frequency range. The characteristics of a serial SQIF have been compared for the first time with those of a single superconducting quantum interference device (SQUID) and a chain of serially connected SQUIDs with equal areas of superconducting loops. The regime of SQIF operation with a voltage-flux (V-Φ) characteristic determined by the magnetic-field dependence of the critical current in the Josephson junction has been analyzed. It is shown that the output noise of a SQIF measured with a cooled amplifier in the 1–2 GHz range is determined by the slope of the V-Φ characteristic. The influence of a spread in the parameters of Josephson junctions in the SQIF on the integral V-Φ characteristic of the whole structure is considered.

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Authors and Affiliations

  1. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009, Russia

    A. V. Shadrin, K. Y. Constantinian & G. A. Ovsyannikov

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  1. A. V. Shadrin
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  2. K. Y. Constantinian
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  3. G. A. Ovsyannikov
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Original Russian Text © A.V. Shadrin, K.Y. Constantinian, G.A. Ovsyannikov, 2007, published in Pis’ma v Zhurnal Tekhnicheskoĭ Fiziki, 2007, Vol. 33, No. 5, pp. 17–24.

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Shadrin, A.V., Constantinian, K.Y. & Ovsyannikov, G.A. Quantum interference filters based on oxide superconductor junctions for microwave applications. Tech. Phys. Lett. 33, 192–195 (2007). https://doi.org/10.1134/S1063785007030030

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  • DOI: https://doi.org/10.1134/S1063785007030030

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