[en] The Liouville equation of a two-level atom coupled to a degenerate bimodal lossy cavity is unitarily and exactly reduced to two uncoupled Liouville equations. The first one describes a dissipative Jaynes-Cummings model and the other one a damped harmonic oscillator. Advantages related to the reduction method are discussed

[en] The complex formation between vanadyl ions and ethylenedithiodiacetic acid (H₂L) has been studied at 25⁰C in 0.5 M-NaClO₄ as inert medium, by measuring the hydrogen ion concentration with a glass electrode. In acidic medium and in the investigated concentration ranges (2.07 mM<=Csub(M)<=7.50 mM, Csub(L) up to 12.5 mM)sup(*) the emf data can be explained assuming the equilibrium: VO²⁺ + L^2- reversible VOL logβ ₁₀₁ = 2.68 +-0.03. (author)

[en] A new method to obtain an operatorial exact solution of a wide class of Markovian master equations is presented. Its key point is the existence of a constant of motion partitioning the Hilbert space into finite-dimensional subspaces. The consequent possibility of representing the reduced density operator as a block diagonal matrix is shown. Each 'block operator' evolves under the action of a non-unitary operator explicitly derived. Our mathematical approach is illustrated applying it to simple physical systems. (author)

[en] The dynamics of a system composed by two pairs of dipolarly coupled two-level atoms is exactly studied. We show that the initial entanglement stored in a couple of atoms not directly interacting is fully transferred to the other pair in a periodic way. We observability of this phenomenon in laboratory is briefly discussed both in terms of its temporal scale and of its stability against uncertainties in the geometrical parameters defining the physical system. (author)

[en] We prove that a mesoscopic Josephson junction, irradiated with a quantum superposition of two 180 -out of phase optical coherent states, exhibits an experimentally observable sensitivity to the quantum coherences of the field state. (orig.)

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