Figure 1
From: Experimental simulation of decoherence in photonics qudits
Experimental setup for implementing dephasing and damping dynamics for qudits encoded in transverse path states of the twin photons.
The lens Lp focuses the pumping beam at the multi-slit plane, generating the state given by equation 17 after the multiple slit40. The SLM1, together with a PBS and the multi-slit can generate partially entangled states. To perform the dephasing dynamics, a spherical lens 
is placed in the configuration 
, creating a multi-slit image on the SLM2 plane. A beam splitter (BS) depicted in dotted line is not used for this implementation. On the amplitude damping dynamics, a cylindrical lens is used to project the image at an infinite distance, instead of the lens 
. In order to realize the damping operations, we place the BS (dotted line) to construct a Sagnac interferometer. The lenses 
and 
are used to create an image or interference pattern according to their positions at the focal plane. We use a half wave plate (HWP) to rotate the polarization of signal photons because the SLM2 modules only horizontal polarization.
