Fig. 2 | Nature Communications

Fig. 2

From: On-chip single photon filtering and multiplexing in hybrid quantum photonic circuits

Fig. 2

On-chip single-photon routing. a A microscope image of the ring resonator filter. The filter transmission is controlled with a titanium resistor, the scale bar has length of 70 µm. Details of the fabrication process are provided in the Methods section. Graphs b and c show the through-port and drop-port transmission of the ring resonator, respectively. d Tuning of the ring resonator filter as a function of the filter voltage (V rr).The red circles show the measured shifts while the blue line is a fit. The resonances are blue shifted by design, which is achieved by means of the large negative thermo-optic coefficient of the PMMA top cladding. e Tuning of the QD transition as a function of the ring resonator voltage. In contrast to the observed shift for the ring resonator, the QD emission red shifts for increasing voltage as expected due to the increase in temperature. Graphs f and g show the results of selectively routing a unique transition of the QD between the drop-port and through-port of the ring resonator. As we tune the filter resonance using the integrated heater, a single emission line can be tuned in and out of resonance, thus routing single photons between the through-port and drop-port

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