Dinâmica de coerência e decoerência de estados em redes de osciladores quânticos dissipativos.
Abstract
In this thesis we studied the coherence and decoherence dynamics of states in
a network of dissipative quantum oscillators. The coherence dynamics refers to
the swap and recurrence process of states between the oscillators composing the
network. These processes become crucial to understand the decoherence dynamics
of states in a network of dissipative quantum oscillators. Beyond the weak coupling
regime between the oscillators, where the dissipative dynamics is ruled by the usual
Liouville operators L`½1;:::;N , associated to each of the ` = 1; :::;N oscillators of
the network, we also considered the strong coupling regime. In this regime, the
dissipative dynamics is also ruled by cross-decay channels Lm;n½1;:::;N (m 6= n =
1; :::;N) which leads to important consequences to the coherence and decoherence
dynamics of quantum states of the network.
Considering a network with only two coupled dissipative oscillators, we reproduce
in this system the phenomenology of the Eletromagneticaly Induced Transparency or
the Dynamical Stark Effect which are typical of the radiation-matter interaction
when one of the oscillators is submitted to linear or parametric amplification process,
respectively.