Controlled Stochastic Amplification of a Weak Signal in a Superconducting Quantum Interferometer

In a single-junction niobium superconducting quantum interferometer (RF SQUID loop), a weak low-frequency harmonic signal is amplified when quasi-white Gaussian noise magnetic flux is applied to the loop; such amplification is due to stochastic resonance (SR). We have experimentally shown that if th...

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Veröffentlicht in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2019-01, Vol.45 (1), p.60-66
Hauptverfasser: Turutanov, O. G., Lyakhno, V. Yu, Pivovar, M. E., Shnyrkov, V. I.
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Sprache:eng
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Zusammenfassung:In a single-junction niobium superconducting quantum interferometer (RF SQUID loop), a weak low-frequency harmonic signal is amplified when quasi-white Gaussian noise magnetic flux is applied to the loop; such amplification is due to stochastic resonance (SR). We have experimentally shown that if the suboptimal flux noise intensity is insufficient for SR, the mean rate of transitions between the metastable states of the loop, and thus the signal gain, can be controlled by an additional deterministic alternating magnetic flux with frequency being much higher than that of the useful signal to provide the maximal possible gain. The frequency characteristics of a multi-tone composite signal amplification in the cases of controlled stochastic amplification and “pure” SR are compared to each other.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.5082311