26 citations · 31 across the 2 of their papers we have counts for
8 papers
Mixedness and entanglement for two-mode Gaussian states
L. A. M. Souza, R. C. Drumond, M. C. Nemes +1
We analytically exploit the two-mode Gaussian states nonunitary dynamics. We show that in the zero temperature limit, entanglement sudden death (ESD) will always occur for symmetri…
Simple Non-Markovian Microscopic Models for the Depolarizing Channel of a Single Qubit
K. M. Fonseca Romero, R. Lo Franco
The archetypal one-qubit noisy channels ---depolarizing, phase-damping and amplitude-damping channels--- describe both Markovian and non-Markovian evolution. Simple microscopic mod…
Semiclassical Dynamics from Zeno-Like measurements
R. Rossi, K. M. Fonseca, Romero M. C. Nemes
The usual semiclassical approximation for atom-field dynamics consists in substituting the field operators by complex numbers related to the (supposedly large enough) intensity of…
Exact Description of Decoherence in Optical Cavities
K. M. Fonseca Romero, M. C. Nemes
The exact reduced dynamics for the independent oscillator model in the RWA approximation at zero and finite temperatures is derived. It is shown that the information about the inte…
Sensitivity to Initial Conditions in Quantum Dynamics: an Analytical Semiclassical Expansion
K. M. Fonseca-Romero, M. C. Nemes, J. G. Peixoto de Faria +1
We construct a class of systems for which quantum dynamics can be expanded around a mean field approximation with essentially classical content. The modulus of the quantum overlap…
Adiabatic Approximation in the Density Matrix Approach: Non-Degenerate Systems
A. C. Aguiar Pinto, K. M. Fonseca Romero, M. T. Thomaz
We study the adiabatic limit in the density matrix approach for a quantum system coupled to a weakly dissipative medium. The energy spectrum of the quantum model is supposed to be…