(color online) (a) and (b) Occupation numbers for the six modes. The coupling strength of panel (a) is induced by the continuous pulses, meanwhile (b) is the Gaussian pulses, we set and 8 in panels (a) and (b) respectively. The quantum state is initially encoded on the left unit SQ (solid, blue) is transferred to the left unit SR (dotted, purple), and the left unit OC (dash-dotted, red) by using coupling strengths and , then the photons radiate to the right unit OC (dashed orange curve), finally the photons are transmitted to the right unit SR (dotted, black) and the right unit SQ (solid, cyan) by utilizing coupling strengths and respectively. (c) The shapes of four Gaussian pulses (dotted, black), (dash–dotted, brown), (thick-dashed, gray) and (dashed, green). The parameters are taken as , , , , , , , , .