Seventy five years ago, three remarkable papers by Schrödinger, Kennard and Darwin were
published. They were devoted to the evolution of Gaussian wave packets for an oscillator, a …

We present a review of theoretical and experimental aspects of multiphoton quantum optics.
Multiphoton processes occur and are important for many aspects of matter–radiation …

In this survey, various generalizations of Glauber–Sudarshan coherent 4 states are
described in a unified way, with their statistical properties and their 5 possible role in non …

A justification is given for the use of non-spreading or frozen gaussian packets in dynamics
calculations. In this work an initial wavefunction or quantum density operator is expanded in …

The rate at which pure initial states deteriorate into mixtures is computed for a harmonic
oscillator interacting with an environment in thermal equilibrium. The decoherence process …

For quantum systems of finitely many particles as well as for boson quantum field theories,
the classical limit of the expectation values of products of Weyl operators, translated in time …

In a continuous representation of Hilbert space, each vector ψ is represented by a complex,
continuous, bounded function ψ (φ)≡(φ, ψ) defined on a set S of continuously many …

For a system with one degree of freedom, coherent states that are parametrized by classical
canonical action-angle variables are introduced. These states also possess continuity of …

States of a quantum mechanical system are represented by rays in a complex Hilbert space.
The space of rays has, naturally, the structure of a Kahler manifold. This leads to a …

The general formalism for path integrals expressed in terms of an arbitrary continuous
representation (generalized coherent states) is applied to give c-number formulations for the …