53 citations · 382 across the 32 of their papers we have counts for
10 papers · 1 filter
Quantum entanglement of bound particles under free center of mass dispersion
Fernanda Pinheiro, A. F. R. de Toledo Piza
On the basis of the full analytical solution of the overall unitary dynamics, the time evolution of entanglement is studied in a simple bipartite model system evolving unitarily fr…
Quantum dynamics of bosons in a double-well potential: Josephson oscillations, self-trapping and ultralong tunneling times
A. N. Salgueiro, A. F. R. de Toledo Piza, G. B. Lemos +3
The dynamics of the population imbalance of bosons in a double-well potential is investigated from the point of view of many-body quantum mechanics in the framework of the two-mode…
Classification of Tripartite Entanglement with one Qubit
Marcio F. Cornelio, A. F. R. de Toledo Piza
We present a method to find the decompositions of tripartite entangled pure states which are smaller than two successive Schmidt decompositions. The method becomes very simple when…
Phases of quantum states in completely positive non-unitary evolution
J. G. Peixoto de Faria, A. F. R. de Toledo Piza, M. C. Nemes
We define an operational notion of phases in interferometry for a quantum system undergoing a completely positive non-unitary evolution. This definition is based on the concepts of…
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…
Time Evolution of tunneling and decoherence: soluble model
A. N. Salgueiro, A. F. de R. de Toledo Piza, J. G. Peixoto de Faria
Decoherence effects associated to the damping of a tunneling two-level system are shown to dominate the tunneling probability at short times in strong coupling regimes in the conte…
Manipulating decay rates by entanglement and the Zeno effect
A. F. R. de Toledo Piza, M. C. Nemes
We analyse a class of quantum dynamical processes which may lead to the hindering of the decay of a non-stationary state through appropriate entanglement with an additional two-lev…
Decoherence of mesoscopic states of cavity fields
K. Fonseca Romero, M. C. Nemes, J. G. Peixoto de Faria +2
We show that two-atom correlation measurements of the type involved in a recent experimental study of the evolution of a mesoscopic superposition state prepared in a definite mode…
The Hydrogen Atom as an Entangled Electron-Proton System
Paolo Tommasini, Eddy Timmermans, A. F. R. de Toledo Piza
We illustrate the description of correlated subsystems by studying the simple two-body Hydrogen atom. We study the entanglement of the electron and proton coordinates in the exact…
Mean Field and Collisional Dynamics of Interacting Fermion-Boson systems in a Soluble Model
E. R. Takano Natti, A. F. R de Toledo Piza
A general time-dependent projection technique is applied to the study of the dynamics of quantum correlations in a system consisting of interacting fermionic and bosonic subsystems…