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Proceedings Paper

Experimental observation of transition between strong and weak non-Markovianity
Author(s): Nadja K. Bernardes; Alvaro Cuevas; Adeline Orieux; Carlos H. Monken; Paolo Mataloni; Fabio Sciarrino; Marcelo F. Santos
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Paper 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.

Paper Details

Date Published: 7 May 2015
PDF: 7 pages
Proc. SPIE 9505, Quantum Optics and Quantum Information Transfer and Processing 2015, 95050X (7 May 2015); doi: 10.1117/12.2194881
Show Author Affiliations
Nadja K. Bernardes, Univ. Federal de Minas Gerais (Brazil)
Alvaro Cuevas, Sapienza Univ. di Roma (Italy)
Adeline Orieux, Sapienza Univ. di Roma (Italy)
Carlos H. Monken, Univ. Federal de Minas Gerais (Brazil)
Paolo Mataloni, Sapienza Univ. di Roma (Italy)
Fabio Sciarrino, Sapienza Univ. di Roma (Italy)
Marcelo F. Santos, Univ. Federal de Minas Gerais (Brazil)

Published in SPIE Proceedings Vol. 9505:
Quantum Optics and Quantum Information Transfer and Processing 2015
Konrad Banaszek; Christine Silberhorn, Editor(s)

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