Experimental verification (IMAGE)
Caption
(a), Circuit used for experimental verification, showing the inductors (L), capacitors (C), resistors (R), diodes (D) and amplifier (A). (b) Photo of the experimental setup. (c-f), Measured resonance frequencies (open circles and diamonds) of the system together with the steady state eigenfrequencies from the simulations (solid lines). (g-j) show the critical behavior near the corresponding EPs and EX in (c-f), respectively. The solid lines are the theoretical predictions. The estimated experimental errors (standard deviation obtained from 8 independent measurements) in (c-j) are smaller than the marker sizes. For demonstration purposes, we exaggerate the error bars by a factor of 100, 100, 50, 50, 10, 10, 10 and 10 in (c-j), respectively. (k-n) show the corresponding (SNR)-1 for different detuning and loss values and the cyan background represents the theoretical fitting.
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