7 May 2015 Experimental observation of transition between strong and weak non-Markovianity
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We experimentally observed in an optical setup and using full tomography process the so-called weak non-Markovian dynamics of a qubit [1]. This was done implementing the collisional model proposed in [2] to investigate the non- Markovian dynamics of an open quantum system interacting with a carefully controlled environment state. We also observed the transition from weak to strong (essentially) non-Markovianity. In our all-optical setup, a single photon system, initially entangled in polarization with an ancilla, is made to interact with a sequence of liquid crystal retarders driven by proper electric pulses, which simulates the environment. Depending on how the voltage is applied on each liquid crystal, it will work as a half-wave plate with different orientations. Then, by changing properly the parameters of the qubit-environment interactions, the system dynamics can suffer a transition from weak to strong non-Markovianity. In the strong regime, the full reconstruction of the entangled state was made by single entanglement witness between system and ancilla, showing a backflow of information, while, in the weak regime, given the contractive unital map feature, we can only measure the dynamics by a full process tomography analysis, searching for the violation of the divisibility completely positive map criterion, what was done successfully.
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Nadja K. Bernardes, Nadja K. Bernardes, Alvaro Cuevas, Alvaro Cuevas, Adeline Orieux, Adeline Orieux, Carlos H. Monken, Carlos H. Monken, Paolo Mataloni, Paolo Mataloni, Fabio Sciarrino, Fabio Sciarrino, Marcelo F. Santos, Marcelo F. Santos, } "Experimental observation of transition between strong and weak non-Markovianity", Proc. SPIE 9505, Quantum Optics and Quantum Information Transfer and Processing 2015, 95050X (7 May 2015); doi: 10.1117/12.2194881; https://doi.org/10.1117/12.2194881

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