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Relying on the Peres-Horodecki criterion, we investigated the dynamics of appearance of the stationary entanglement in the system of two two-level atoms decaying in the field of common thermostat. We took into account their dipole-dipole interaction and the difference between their atomic frequencies. It was established, that in the absence of the dipole-dipole interaction the presence of the stationary entanglement has a strong dependence on the identity of atomic frequencies. The difference between them (due to their different locations in the crystal or thermal movement), leads to a disappearance of the stationary entanglement. Also we found the dependence of existence of the stationary entanglement from a correlation between the constant of the dipole-dipole interaction, the resonance wave shift and the constant of interaction with the thermostat field - it comes into existence only when the latter value becomes greater than the former ones.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

The master equation for impurity atom in photonic band gap crystal is derived with account for two-atom and two-photon relaxation processes. Important role of these relaxation processes is clarified.

Kinetic equations describing atomic behavior in non-resonant classical and broadband squeezed fields are received. It is shown that the main parameters of squeezed field can be obtained from the decay of two-pulse photon echo.

A nonlinear evolution equation describing an ultrashort optical pulse propagation under quasi-resonant condition is derived by the unitary transformation method. This method allowed us to obtain the terms which are not taken into account within the framework of the adiabatic following approximation. The analysis of the nonlinear evolution equation and example of its application are given.

The master equation for impurity atom in photonic band gap crystal is derived with account for two-atom and two-photon relaxation processes. An important role of these relaxation processes is clarified.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

It is shown that the additional irradiation of thin film of resonant atoms by squeezed light causes the bistability depending on phase of resonant coherent light.