Quantum flux parametron with magnetic flux regulator

Renewed interest in Quantum Flux Parametrons (QFPs) and their properties has occurred due to new applications of these devices for current comparators and timing discriminators [l]. Current noise (inferred from switching probabilities) of these devices has been measured as a function of exciter slew rates. We have found that at high slew rates the switching probability follows an error-function distribution quite closely. However, at low slew rates, the distribution resembles a Fermi-Dirac distribution. Good agreement with Monte-Carlo simulations for high slew-rates is seen with a current noise proportional to the Johnson noise of the damping resistors [2]. The current noise decreases with decreasing slew rate and is in good agreement with thermal activation calculations in the limit of slow slew rates.

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Quantum flux parametron with magnetic flux regulator

Cited by 2 publications

References 15 publications

High-speed experiments on a QFP-based comparator for ADCs with 18-GHz sample rate and 5-GHz input frequency

High-speed experiments on a QFP-based comparator for ADCs with 18-GHz sample rate and 5-GHz input frequency

Switching probability of QFP comparators as a function of exciter slew-rate

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