Fig. 3: Soliton steps of DKS comb and the corresponding HOM interferences and Bell-state measurements with different comb states.
From: A measurement-device-independent quantum key distribution network using optical frequency comb
a The power change of the frequency comb with wavelength detuning between the pump laser and the resonance of MRR, showing the evolution of the soliton steps of DKS comb. b, c The results of HOM interference (blue circles) and BSM (red circles) with chaotic state of the comb generation, indicated by the green vertical line (marked with I) in (a). d, e The results of HOM interference (blue circles) and BSM (red circles) with 4-soliton state of the comb generation, indicated by the red vertical line (marked with II) in (a). The excellent coherence of the DKS comb enables the high-visibility interference in HOM and BSM.
