Fig. 2: Experimental setup.
From: Quantum state processing through controllable synthetic temporal photonic lattices
A coupler connects two polarization-maintaining fibre loops of 120 m (600 ns) for the long loop and 100 m (500 ns) for the short loop. AFGs dynamically control the coupler’s transmittance. The setup also includes a pulsed laser; an acousto-optic modulator (AOM) to reduce the repetition rate of the laser; PPLN nonlinear crystals to generate photons through SHG and SPDC; phase modulator; wavelength demultiplexer (WDM); oscilloscope; photodetector (PD); and two SNSPDs. The oscilloscope and PDs are used in the classical part of the experiment.
