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 …

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 …

The photon distribution function of an N-mode mixed state of light described by the Wigner
function of generic Gaussian form is calculated explicitly in terms of the Hermite polynomials …

For one-mode light described by the Wigner function of a generic Gaussian form with five
real parameters, the photon distribution function is obtained explicitly in terms of the Hermite …

Photon-added even and odd coherent states of light are introduced. The mathematical and
physical properties of such states are studied. The behaviour of the squeezing coefficient …

The even and odd coherent states are generalized for the multimode case. The explicit
forms for the photon distribution, Q function, and Wigner function are derived. In particular, it …

The multimode even and odd coherent states (multimode Schrödinger cat states) are
constructed for polymode parametric oscillators of the electromagnetic field. The evolution of …

We develop the tomographic-probability picture where quantum states of qudits (spin-j
systems, N-level atoms) are described by means of sets of fair classical probability …

Using the two-mode realization of the su (1, 1) Lie algebra, we define new states that
equalize the su (1, 1) uncertainty relation. We refer to these as two-mode intelligent SU (1, 1) …