Fig. 2: Experimental setup for the generation and measurement of correlated/entangled photon-pairs.
From: High-performance quantum entanglement generation via cascaded second-order nonlinear processes
a Setup for preparing correlated/entangled photon-pairs. b Setup for characterizing correlated photon-pairs. c Setup for characterizing energy–time and time-bin entanglement. The synchronous signal is from AWG as shown in Fig. 2a. d Setup for coherently manipulating the energy–time-entangled two-photon state. e Setup for preparing and characterizing frequency-bin entangled photon-pairs. The λp in Fig. 2a is 1540.46 nm and λs,i = 1531.72 nm, 1549. 34 nm in (b–e). IM intensity modulator, EDFA erbium-doped fiber amplifier, VOA variable optical attenuator, PC polarization controller, BS beam splitter, PBS polarization beam splitter, DWDM dense wavelength division multiplexer, PPLN periodically poled LiNbO3, UMZI unbalanced Mach–Zehnder interferometer, VODL variable optical delay line, AWG arbitrary waveform generator, TDC time to digital convertor, SNSPD superconducting nanowire single-photon detector.
