Optimal control and non-Markovian effects in driven open quantum systems

Presenting Author: Pablo Poggi, Universidad de Buenos Aires (Argentina)
Contributing Author(s): Nicolas Mirkin, Diego Wisniacki

Non-Markovian effects arising in open quantum systems evolution have been a subject of increasing interest over the past decade. One of the most appealing features of non-Markovianity (NM) is that it captures scenarios where loss of information and coherence are reversible, and thus a temporary backflow of information from the environment to the system is possible. In this work we first tackle the issue of how the presence of a driving field can affect the non-Markovian features of open quantum system dynamics. By studying a paradigmatic model of a two-level system coupled to an structured bath, we show that the driving can greatly enhance the degree of non-Markovianity with respect to the undriven case. Then, we present an extensive numerical study about the role played by non-Markovian effects when controlling such systems. We find that the regions which were originally more non-Markovian are compatible with the regions where the best control is achieved. However, we also observe that the driving-field-induced change of the degree of NM does not necessarily lead to an improvement in the fidelities achieved.

Read this article online: http://iopscience.iop.org/article/10.1209/0295-5075/118/20005/meta

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