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Seminário do grupo de Óptica e Informação Quântica

Data: Sexta-Feira 07/12/2018, Sala A5-01, 11 am.

Palestrante: Paola A. Concha Obando (UFF)

Title: Non-Markovian processes in open quantum systems.

Abstract:  Recent developments about the problem of decoherence in 
quantum mechanics have heightened
the need for the consistent description of open quantum systems [1, 2]. 
The theory of open quantum
systems is fundamental to describe a wide range of applications of 
quantum physics, since perfect isolation
of quantum systems is not possible and since a complete microscopic 
description or control of the
environmental degrees of freedom is not feasible or only partially so. 
Under certain conditions, there is
a well-established treatment of the dynamics of open quantum systems in 
which the open system’s time evolution is represented
by Markovian quantum master equation, which is obtained if one assumes a 
weak coupling system-environment interaction.
On the other hand, in many scenarios, a large separation between system 
and environment time scales can no longer be assumed,
leading to non- Markovian behavior and eventually a back-flow of 
information from the environment into the system.
  Basically, two main questions need to be discussed in this context [3]:

• What is a quantum Markovian process and hence what are non-Markovian 
processes?
(characterization problem).

• If a given process deviates from Markovianity, by how much does it 
deviate? (quan-
tification problem).

In this seminar, I intend to discuss these questions, showing some 
results that were part my PhD research at Universidade Federal 
Fluminense and  our last results in the non-Markovian quantification 
through quantum coherence, from a theoretical and experimental point of 
view [3,4].


[1] BREUER, H.-P.; PETRUCCIONE, F. The theory of open quantum systems. 
Oxford University Press on Demand, 2002.
[2] RIVAS, A.; HUELGA, S. F.; PLENIO, M. B. Quantum non-markovianity: 
characterization, quantification and detection. Reports on Progress in 
Physics, IOP Publishing, v. 77, 2014.
[3] PAULA, F. M.; OBANDO, P. C.; SARANDY, M. S. Non-markovianity through 
multipartite correlation measures. Physical Review A, APS, v. 93, n. 4, 
2016.
[4] PASSOS, M. ; OBANDO, P. C. ; BALTHAZAR, W. F. ; PAULA, F. M. ; 
HUGUENIN, J. A. O. ;
SARANDY, M. S. . Non- Markovianity through quantum coherence in an 
all-optical setup (Preprint) arXiv:1807.05378 [quant-ph], 2018.