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Detection of small single-cycle signals by stochastic resonance using a bistable superconducting quantum interference device
15. G. Sun, N. Dong, G. Mao, J. Chen, W. Xu, Z. Ji, L. Kang, P. Wu, Y. Yu, and D. Xing, Phys. Rev. E 75, 021107 (2007).
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We propose and experimentally demonstrate detecting small single-cycle and few-cycle signals by using the symmetric double-well potential of a radio frequency superconducting quantum interference device (rf-SQUID). We show that the response of this bistable system to single- and few-cycle signals has a non-monotonic dependence on the noise strength. The response, measured by the probability of transition from initial potential well to the opposite one, becomes maximum when the noise-induced transition rate between the two stable states of the rf-SQUID is comparable to the signal frequency. Comparison to numerical simulations shows that the phenomenon is a manifestation of stochastic resonance.
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