11 citations · 33 across the 7 of their papers we have counts for
3 papers · 1 filter
Extremal Density Matrices for Qudit States
Armando Figueroa, Julio A. López-Saldívar, Octavio Castaños +1
An algebraic procedure to find extremal density matrices for any Hamiltonian of a qudit system is established. The extremal density matrices for pure states provide a complete desc…
Discretization of the density matrix as a nonlinear positive map and entanglement
Julio A. López-Saldívar, Armando Figueroa, Octavio Castaños +3
The discretization of the density matrix is proposed as a nonlinear positive map for systems with continuous variables. This procedure is used to calculate the entanglement between…
Evolution and entanglement of Gaussian states in the parametric amplifier
Julio A. López-Saldívar, Armando Figueroa, Octavio Castaños +3
The linear time-dependent constants of motion of the parametric amplifier are obtained and used to determine in the tomographic-probability representation the evolution of a genera…