Fig. 9: Experimental setup scheme for the measurement of frequency-bin entanglement. | npj Nanophotonics

Fig. 9: Experimental setup scheme for the measurement of frequency-bin entanglement.

From: A silicon integrated source of hyper-entangled photon pairs with rate exceeding 1 billion pairs per second

Fig. 9: Experimental setup scheme for the measurement of frequency-bin entanglement.

The generated pairs are multiplexed on chip. An arbitrary projector is implemented by a waveshaper that is used as a bandpass filter to select two adjecent resonances per channel that are energy-correlated between the channels. An electro-optic phase modulator (EOM) realizes a superposition of frequency bins and finally tunable Bragg gratings (TBG) realize the projector on the computational base.

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