130 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal de Minas GeraisBR58 papers
- Universidade Federal de Santa CatarinaBR17 papers
- Universidade Federal do Rio de JaneiroBR15 papers
- Laboratório Nacional de AstrofísicaBR13 papers
- Consejo Nacional de Investigaciones Científicas y TécnicasAR10 papers
- Universidade Federal dos Vales do Jequitinhonha e MucuriBR10 papers
- Universidade Federal de LavrasBR9 papers
- University of La SerenaCL8 papers
- Argentine National ObservatoryAR7 papers
- Centre National de la Recherche ScientifiqueFR7 papers
- Universidade de São PauloBR7 papers
- Universidade Federal da ParaíbaBR7 papers
21 papers · 1 filter
Experimental realisation of multipartite entanglement via quantum Fisher information in a uniform antiferromagnetic quantum spin chain
George Mathew, Saulo L. L. Silva, Anil Jain +9
Quantum entanglement is a quantum mechanical phenomenon where the quantum state of a many-body system with many degrees of freedom cannot be described independently of the state of…
Jarzynski equality for superconducting optical cavities: an alternative path to determine Helmholtz free energy
Josiane Oliveira Rezende de Paula, J. G. Peixoto de Faria, J. G. G. de Oliveira +2
A superconducting cavity model was proposed as a way to experimentally investigate the work performed in a quantum system. We found a simple mathematical relationship between the f…
Quantum phase transition in an effective three-mode model of interacting bosons
H. M. Frazão, J. G. Peixoto de Faria, G. Q. Pellegrino +1
In this work we study an effective three-mode model describing interacting bosons. These bosons can be considered as exciton-polaritons in a semiconductor microcavity at the magic…
Quantum erasure in the presence of a thermal bath: the effects of system-environment microscopic correlations
A. R. Bosco de Magalhães, J. G. Peixoto de Faria, R. Rossi
We investigate the role of the environment in a quantum erasure setup in the cavity quantum electrodynamics domain. Two slightly different schemes are analyzed. We show that the ef…
Atomic Focusing by Quantum Fields: Entanglement Properties
I. G. da Paz, H. M. Frazão, M. C. Nemes +1
The coherent manipulation of the atomic matter waves is of great interest both in science and technology. In order to study how an atom optic device alters the coherence of an atom…
Parametric Competition in non-autonomous Hamiltonian Systems
L. A. M. Souza, J. G. P. Faria, M. C. Nemes
In this work we use the formalism of chord functions (\emph{i.e.} characteristic functions) to analytically solve quadratic non-autonomous Hamiltonians coupled to a reservoir compo…
Geometry of the adiabatic theorem
A. C. Lobo, R. A. Ribeiro, P. R. Dieguez +1
We present a simple and pedagogical derivation of the quantum adiabatic theorem for two level systems (a single qubit) based on geometrical structures of quantum mechanics develope…
Continuous Monitoring of Dynamical Systems and Master Equations
L. F. Lopes Oliveira, R. Rossi, A. R. Bosco de Magalhaes +2
We illustrate the equivalence between the non-unitary evolution of an open quantum system governed by a Markovian master equation and a process of continuous measurements involving…
Geometry in the entanglement dynamics of the double Jaynes-Cummings model
A. R. Vieira, J. G. G. de Oliveira Junior, J. G. Peixoto de Faria +1
We report on the geometric character of the entanglement dynamics of to pairs of qubits evolving according to the double Jaynes-Cummings model. We show that the entanglement dynami…
Experimental proposal for measuring the Gouy phase of matter waves
I. G. da Paz, P. L. Saldanha, M. C. Nemes +1
The Schrödinger equation for an atomic beam predicts that it must have a phase anomaly near the beam waist analogous to the Gouy phase of an electromagnetic beam. We propose here a…
Residual entanglement and sudden death: A direct connection
J. G. Oliveira Junior, J. G. Peixoto de Faria, M. C. Nemes
We explore the results of [V. Coffman, et al., Phys. Rev. A 61 (2000) 052306] derived for general tripartite states in a dynamical context. We study a class of physically motivated…
Effectively irreversible fringe contrast attenuation induced by one degree of freedom
A. R. Bosco de Magalhães, Adélcio C. Oliveira
The attenuation of fringe contrast in a Ramsey interferometer induced by the atom-field interaction is analyzed. We show that short-time power series expansion is not the proper to…
Control of state and state entanglement with a single auxiliary subsystem
R. Rossi, A. R. Bosco de Magalhães, J. G. Peixoto de Faria +1
We present a strategy to control the evolution of a quantum system. The novel aspect of this protocol is the use of a \emph{single auxiliary subsystem}. Two applications are given,…
Incomplete Entanglement: consequences for the QZE
R. Rossi, A. R. Bosco de Magalhaes, M. C. Nemes
We show that the Quantum Zeno Effect prevails even if the entanglement with the measuring probe is not complete. The dynamics towards the asymptotic regime as a function of , th…
Indirect evidence for the Gouy phase for matter waves
I. G. da Paz, M. C. Nemes, C. H. Monken +2
We show that the well known geometric phase, the Gouy phase in optics can be defined for matter waves in vacuum as well. In particular we show that the underlying physics for the "…
Quantifying the decay of quantum properties in single-mode states
L. A. M. Souza, M. C. Nemes, M. França Santos +1
The dissipative dynamics of Gaussian squeezed states (GSS) and coherent superposition states (CSS) are analytically obtained and compared. Time scales for sustaining different quan…
Quantum Zeno Effect in Cavity QED: Experimental Proposal with Non Ideal Cavities and Detectors
R. Rossi, A. R. Bosco de Magalhaes, M. C. Nemes
We propose an experiment with two coupled microwave cavities and a "tunneling" photon observed by the passage of Rydberg atoms. We model the coupled cavities as in Ref. \cite{art1}…
Atomic detection in microwave cavity experiments: a dynamical model
R. Rossi, M. C. Nemes, J. G. Peixoto de Faria
We construct a model for the detection of one atom maser in the context of cavity Quantum Electrodynamics (QED) used to study coherence properties of superpositions of electromagne…
Entanglement versus energy in the entanglement transfer problem
Daniel Cavalcanti, J. G. Oliveira, J. G. Peixoto de Faria +2
We study the relation between energy and entanglement in an entanglement transfer problem. We first analyze the general setup of two entangled qubits (a and b) exchanging this enta…
Time evolution of the classical and quantum mechanical versions of diffusive anharmonic oscillator: an example of Lie algebraic techniques
J. G. Peixoto de Faria
We present the general solutions for the classical and quantum dynamics of the anharmonic oscillator coupled to a purely diffusive environment. In both cases, these solutions are o…
Classical and quantum coupled oscillators: symplectic structure
A. R. Bosco de Magalhães, C. H. d'Ávila Fonseca, M. C. Nemes
We consider a set of N linearly coupled harmonic oscillators and show that the diagonalization of this problem can be put in geometrical terms. The matrix techniques developed here…