54 citations · 72 across the 9 of their papers we have counts for
9 papers
Preparation of a superposition of squeezed coherent states of a cavity field via coupling to a superconducting charge qubit
Dagoberto S. Freitas
The generation of nonclassical states of a radiation field has become increasingly important in the past years given its various applications in quantum communication. The feasibil…
Dynamics of entanglement among the environment oscillators of many-body systems
A. L. de Paula, Dagoberto S. Freitas
In this work we extend the discussion that was began in the Ref. [A. L. de Paula Jr., J. G. G. de Oliveira Jr., J. G. Peixoto de Faria, Dagoberto S. Freitas and M. C. Nemes, {\it P…
Stochastic coupling in two modes systems: the weak-strong coupling transition
Dagoberto S. Freitas, M. C. Nemes
We investigate the weak-strong coupling transition of two linearly coupled systems under the influence of a phase fluctuating coupling. In the weak coupling regime the exponential…
Preparation of Schrödinger cat states of a cavity field via coupling to a superconducting charge qubit
Dagoberto S. Freitas, M. C. Nemes
We extend the approach of Ref. [Yu-xi Liu, L. F. Wei, and F. Nori, Europhys. Lett. 67, 941 (2004)] for preparing superposition states of a cavity field interacting with a supercond…
Dynamics of a superconducting qubit coupled to the quantized cavity field: a unitary transformation approach
Dagoberto S. Freitas, A. Vidiella-Barranco, J. A. Roversi
We present a novel approach for studying the dynamics of a superconducting qubit in a cavity. We succeed in linearizing the Hamiltonian through the application of an appropriate un…
Preparation of Schrödinger cat states with cold ions in a cavity beyond the Lamb-Dicke limit
Dagoberto S Freitas, Jairo R Rocha
We investigate the dynamics of a cold trapped ion coupled to the quantized field inside a high-finesse cavity. We have used an approach for preparing the SC states of motion of ion…