Experimental observation of transition between strong and weak non-Markovianity

Nadja K. Bernardes; Alvaro Cuevas; Adeline Orieux; Carlos H. Monken; Paolo Mataloni; Fabio Sciarrino; Marcelo F. Santos

doi:10.1117/12.2194881

7 May 2015 Experimental observation of transition between strong and weak non-Markovianity

Nadja K. Bernardes, Alvaro Cuevas, Adeline Orieux, Carlos H. Monken, Paolo Mataloni, Fabio Sciarrino, Marcelo F. Santos

Proceedings Volume 9505, Quantum Optics and Quantum Information Transfer and Processing 2015; 95050X (2015) https://doi.org/10.1117/12.2194881
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

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, Alvaro Cuevas, Adeline Orieux, Carlos H. Monken, Paolo Mataloni, Fabio Sciarrino, and 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); https://doi.org/10.1117/12.2194881

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KEYWORDS

Liquid crystals

Tomography

Quantum communications

Polarization

Wave plates

Entangled states

Error analysis

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