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By using observations from pump-probe stroboscopic confocal microscopy andspectroscopy, we demonstrate the dynamics of trions and the fractional quantumHall edge on the order of $\sim1$ ps. The propagation of the quantum Hall edgestate excited by a voltage pulse is detected as a temporal change inreflectance in the downstream edge probed by optical pulses synchronized withthe voltage pulse. The temporal resolution of such stroboscopic pump-probemeasurements is as fast as the duration time of the probe pulse ($\sim1$ ps).This ultra-fast stroboscope measurement enables us to distinguish between thenormal mode of edge excitation, known as the edge magneto-plasmon or chargedensity wave, and other high-energy non-linear excitations. This is the onlyexperimental method available to study the ultra-fast dynamics of quantum Halledges, and makes it possible to derive the metric tensor $g_{\mu \nu}$ of the$(1+1)=2$-dimensional curved spacetime in quantum universe and black holeanalogs implemented in the quantum Hall edge.

Dynamics of the fractional quantum Hall edge probed by stroboscope measurements of trions