The term'nonclassical states' refers to the quantum states that cannot be produced in the
usual sources of light, such as lasers or lamps, rather than those requiring more …

We study the time evolution for the quantum harmonic oscillator subjected to a sudden
change of frequency. It is based on an approximate analytic solution to the time dependent …

An extension of the classical orthogonal functions invariant to the quantum domain is
presented. This invariant is expressed in terms of the Hamiltonian. Unitary transformations …

The Wigner function is known to evolve classically under the exclusive action of a quadratic
Hamiltonian. If the system also interacts with the environment through Lindblad operators …

We develop a matrix perturbation method for the Lindblad master equation. The first‐and
second‐order corrections are obtained and the method is generalized for higher orders. The …

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 equal …

Our aim is to present an analytical solution for the quantum optics model that has two two-
level atoms interacting together and interacting with an intensity-dependent quantized field …

We study the possibility of reconstructing the quantum state of light in a cavity subject to
dissipation. We pass atoms, also subject to decay, through the cavity and surprisingly show …

We show that the set of s-parametrized quasiprobability distribution functions corresponding
to an electromagnetic field in a cavity subject to dissipation can be directly measured. Such …

A class of nonlinear coherent states related to the Susskind-Glogower (phase) operators is
obtained. We call these nonlinear coherent states as Bessel states because the coefficients …