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Controllable switching at 23.4973 MHz. With an of 1.0 dBm, , and of 4.0 dBm, the beam shows the distinctive response of the bistable switch. The amplitude of the switch is approximately 60 μV, which matches the size of the drop-step seen in a frequency sweep performed with a vector network analyzer. The bottom panel shows the modulation signal; the switch response remains in phase with the modulation signal.
Temperature variation of the hysteresis region, taken at 300 and 680 mK. Note that the width and location of the hysteresis are both altered with increasing temperature.
Effect of temperature on switching control and magnitude. (a) Representative scans at 300 and 825 mK, with associated histogram plots depicting the separation of the signal into two separate and distinct states. At low temperature, the switching is full and complete; the histogram shows two sharp peaks centered at the mean of each state. As temperature is increased, the noise of each state also increases. Switching fidelity is also lost, as can be seen from the definite disparity between the sizes of the respective histogram peaks. (b) Graph of the changes in gap size (solid line) and the average state noise as defined by the width of each histogram peak (diamonds) with temperature. Increases in temperature lead to an overall decrease in gap size, with an overall increase in state noise. (c) Plot of residence time fraction (RTF) for each state as a function of temperature. As the temperature is increased the RTF for the lower state (inverted triangles) increases, while that of the upper state (triangles) decreases correspondingly.
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