arXiv subjects

Dagoberto S Freitas

Publications and source records attributed to Dagoberto S Freitas.

2 recordsLinked to original sources

arXiv2010

Preparation of Schrödinger cat states with cold ions in a cavity beyond the Lamb-Dicke limit

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. This approach, based on unitary transformating the Hamiltonian, allows its exact diagonalization without performing the Lamb-Dicke aproximation. We show that is possible to generate a SC states having rather simple initial state preparation, e.g., the vacuum sate for both cavity field and the ion motion.

quant-ph↗

arXiv2000

A Variational Approach in the Dissipative Nonlinear Schrödinger Equation

The properties of pulse propagation in a nonlinear fiber including linear damped term added in the usual nonlinear Schrödinger equation is analyzed analytically. We apply variational modified approach based on the lagrangian that describe the dynamic of system and with a trial function we obtain a solution which is more accuracy when compared with a pertubative solution. As a result, the problem of pulse propagation in a fiber with loss can be described in good agreement with exact results.

physics.optics↗