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Flux amplification using stochastic superconducting quantum interference devices
Rouse, R. Han, Siyuan Lukens, J. E.
Rouse, R.
Han, Siyuan
Lukens, J. E.
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Abstract
The flux change δ Φ through a bistable superconducting quantum interference device has been measured in the presence of thermally induced switching (with rate Γ) versus δ Φ x , the change in the applied flux. For small δ Φ x , δ Φ is proportional to δ Φ x with a measured flux gain g, depending on the temperature, barrier height, and frequency Ω, with a maximum of about 16. In agreement with theories of periodically driven stochastic bistable systems,g(Ω) is nearly frequency independent up to Γ and is proportional to Ω−1 for Ω≫Γ. For larger amplitude signals, harmonic generation has been measured in the adiabatic limit (Ω≪Γ) and found to be in good agreement with theory. Possible applications of this system for flux measurement are discussed.
Description
This is the published version, also available here: http://dx.doi.org/10.1063/1.114161.
Date
1995-01-05
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Publisher
American Institute of Physics
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Keywords
Adiabatic theorem, Quantum measurement theory, Superconducting quantum interference devices, Height measurements, Nonlinear optics
Citation
Rouse, R., Han, Siyuan., Lukens, J. E. "Flux amplification using stochastic superconducting quantum interference devices." Appl. Phys. Lett. 66, 108 (1995); http://dx.doi.org/10.1063/1.114161.