Relation between the autocorrelation and Wigner functions

We show a simple mechanism to measure the Wigner function of a harmonic oscillator. For this system we also show that autocorrelation and Wigner functions are equivalent.Comment: Modified title and slightly modified version from the one publishe

Perturbative approach to diatomic lattices

By using a small rotation approach, we show that it is possible to obtain well behaved perturbed solutions for the amplitude of the electromagnetic field propagating in a photonic waveguide array. This array mimics the propagation of a quasiparticle among the sites of an infinite one-dimensional chain.Comment: 7 pages, 4 figure

Europa ante la xenofobia y sus responsabilidades

Hace tiempo que Europa se viene desnudando de sus valores fundacionales, muchos de ellos desde hace tiempo por los suelos donde son pisoteados según las necesidades de los Estados. El Plan de Acción conjunto acordado entre los gobierno de la UE y Turquía en la madrugada del 8 de marzo es un ejemplo más del retroceso de Europa y su hundimiento en el fango de la xenofobia, el egoísmo, la insolidaridad y el nacionalismo identitario europeo. Pero ese fango no surge de la nada

Statistical properties of London modified coherent states

In this paper we discuss statistical properties of modified London coherent states, that were introduced in order build up a resolution of the identity for London coherent states. In particular, we show that there exist sub-Poissonian behaviour for a large interval of amplitudes and, because their oscillating photon distribution, they show ringing revivals of the atomic inversion.Comment: 8 pages, 4 figure

Non-Hermitian propagation in Hermitian Glauber-Fock optical lattices

The effect of a non-unitary transformation on an initial Hermitian operator is studied. The initial (Hermitian) optical system is a Glauber-Fock optical lattice. The resulting non-Hermitian Hamiltonian models an anisotropic (Glauber-Fock) system of waveguides of the Hatano-Nelson-type. Several cases are analyzed and exact analytical solutions for both the Hermitian and non- Hermitian Schr\"odinger problems are given, as they are simply connected. Indeed, such transformation can be regarded as a non-unitary Supersymmetric (SUSY) transformation and the resulting non-Hermitian Hamiltonian can be considered as representing an open system that interchanges energy with the environment