Showing papers on "Amplitude damping channel published in 1985"
TL;DR: In this article, the Glauber distribution P(α) for free-electron laser fields is derived, which represents the superposition of a coherent field (stimulated emission) and an incoherent one (spontaneous emission).
Abstract: We describe the quantum initiation for free-electron lasers and derive the collective instability threshold starting from the electron position and the momentum quantum fluctuations. We obtain the Glauber distribution P(α) for the field, that is, a displaced Gaussian, which represents the superposition of a coherent field (stimulated emission) and an incoherent one (spontaneous emission). We define and discuss the concept of superradiance for free-electron lasers, both in a classical framework and at a quantum statistical level, stating the conditions under which the effect should be observed.
23 citations
TL;DR: In this paper, a coarse-grain average of the cross-section of the S-matrix product for heavy-ion reactions is presented. But the average does not take the effects of the nonthermalized relative motion properly into account.
1 citations
TL;DR: In this article, the problem of selection of preferred basis during passage from quantum to classical systems is treated with the help of a simple example of a 2-state system like the sugar molecule.
Abstract: The problem of selection of preferred basis during passage from quantum to classical systems is treated with the help of a simple example of a 2-state system like the sugar molecule. A simple principle leading to this selection is stated and demonstrated in case of the chosen example. The principle, stated simply is that the preferred basis is the one in which the system environment interaction hamiltonian is diagonal.