7 papers
The anisotropic quantum Rabi model with diamagnetic term
Jorge A. Anaya-Contreras, Irán Ramos-Prieto, Arturo Zúñiga-Segundo +1
We employ a squeeze operator transformation approach to solve the anisotropic quantum Rabi model that includes a diamagnetic term. By carefully adjusting the amplitude of the diama…
Purification Hamiltonians
Jorge A. Anaya-Contreras, Arturo Zúñiga-Segundo, Héctor M. Moya-Cessa
We study the Jaynes-Cummings interaction when initial mixed states, for the atom or the field, are considered. The evolved mixed field density matrix is purified to a wavefunction…
Quasiprobability distribution functions from fractional Fourier transforms
Jorge A. Anaya-Contreras, A. Zúñiga-Segundo, Héctor M. Moya-Cessa
We show, in a formal way, how a class of complex quasiprobability distribution functions may be introduced by using the fractional Fourier transform. This leads to the Fresnel tran…
Squeeze operators in classical scenarios
Jorge A. Anaya-Contreras, Arturo Zúñiga-Segundo, Francisco Soto-Eguibar +2
We analyse the paraxial field propagation in the realm of classical optics, showing that it can be written as the action of the fractional Fourier transform, followed by the squeez…
Entropy fluctuations as a mixedness quantifier
Jorge A. Anaya-Contreras, Arturo Zúñiga-Segundo, Héctor M. Moya-Cessa
We propose a mixedness quantifier based on entropy fluctuations. It provides information about the degree of mixedness either for finite dimensional and infinite dimensional Hilber…
The von Neumann Entropy for Mixed States
Jorge A. Anaya-Contreras, Héctor M. Moya-Cessa, Arturo Zúñiga-Segundo
The Araki-Lieb inequality is commonly used to calculate the entropy of subsystems when they are initially in pure states as this forces the entropy of the two subsystems to be equa…