Figure 2
The experiment setup for the demonstration of hyper-entanglement in energy-time and polarization.
(a) Two CW pump lights with orthogonal polarizations and different frequencies are combined by a PBC, then injected into a piece of DSF to stimulate the vector SFWM processes, generating correlated signal and idler photons with orthogonal polarizations. The signal and idler photons are routed to two paths according to their frequencies by an optical filter module realized by cascaded DWDMs. The generated photon pairs are measured by the quantum states analyzer for specific entanglement and two SNSPDs. The measurement results are recorded by a TCSPC module. (b) The quantum state analyzer for energy-time entanglement, composed of two UMZIs. (c) The quantum state analyzer for polarization entanglement, composed of two fiber polarization controllers (FPCs) and two rotatable polarizers (Ps).
