Fig. 2 | npj Quantum Information

Fig. 2

From: On-chip transverse-mode entangled photon pair source

Fig. 2

Sketch map for the experimental setup and measurement results. a An amplified CW laser is coupled to the device via a fiber array, and two DWDMs are used to separate the idler, signal and pump photons into different frequencies. b, c The continuous emission spectra for the signal and idler photons from ports TE0 and TE1, respectively. The spectra are filtered by a 40-channel DWDM system, with the frequencies of the correlated photon pairs equally separated from the central pump frequency. d–g Coincidence measurements of the photon pairs in different transverse-mode combinations. Solid curves are the corresponding theoretical results in Fig. 1d

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