论文标题
在可热双向约瑟夫森弱链接和微区的随机共振中
Stochastic resonance in thermally bistable Josephson weak-links and micro-SQUIDs
论文作者
论文摘要
基于收缩的Josephson弱链接显示了两个表现为零和有限电压的状态之间的热稳定性。这在实验中表现为弱链路中电流特性的滞后，或者是电压中的随机电气信号。在后一种情况下，观察到设备正弦激发的噪声驱动的放大，以与电视信号中的特征开关频率相匹配的频率，这种现象称为随机共振。使用随机共振的两态模型来理解观察到的行为，并被利用以说明微分方作为磁场传感器的微分方面的信噪比增强。
Constriction-based Josephson weak-links display a thermal bi-stability between two states exhibiting zero and finite voltages. This manifests in experiments either as hysteresis in weak-links current voltage characteristics or as random telegraphic signal in voltage. In the latter case, a noise-driven amplification of a sinusoidal excitation of the device is observed, at frequencies matching the characteristic switching frequency in telegraphic signal, a phenomenon known as stochastic resonance. The observed behavior is understood using a two-state model of stochastic resonance and is exploited to illustrate an enhanced signal-to-noise-ratio in a micro-SQUID as a magnetic field sensor.
