All-optical implementation of collision-based evolutions of open quantum systems

We present a new optical scheme enabling the implementation of highly stable and confgurable nonMarkovian dynamics. Here one photon qubit can circulate in a multipass bulk geometry consisting of two concatenated Sagnac interferometers to simulate the so called collisional model, where the system interacts at discrete times with a vacuum environment. We show the optical features of our apparatus and three diferent implementations of it, replicating a pure Markovian scenario and two nonMarkovian ones, where we quantify the information backfow by tracking the evolution of the initial entanglement between the system photon and an ancillary one.