Table 1 A list of contributing SFWM processes (left column) to corresponding signal-idler polarization states (right column).

From: Polarization-entangled photon pair sources based on spontaneous four wave mixing assisted by polarization mode dispersion

SFWM processes

Signal-idler state

HHHH and HHVV

HH

VVVV and VVHH

VV

HVHV and HVVH

HV

VHHV and VHVH

VH

  1. The first, second, third, and forth letters specify polarization states of the signal, idler, first pump, and second pump photons.
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