Physics – Quantum Physics
Scientific paper
2005-07-11
Int.J.Mod.Phys.B20:2951-2976,2006
Physics
Quantum Physics
20 pages, 4 figures. Version to appear in Int. J. Mod. Phys. B
Scientific paper
10.1142/S0217979206034959
The effect induced by an environment on a composite quantum system is studied. The model considers the composite system as comprised by a subsystem A coupled to a subsystem B which is also coupled to an external environment. We study all possible four combinations of subsystems A and B made up with a harmonic oscillator and an upside down oscillator. We analyzed the decoherence suffered by subsystem A due to an effective environment composed by subsystem B and the external reservoir. In all the cases we found that subsystem A decoheres even though it interacts with the environment only through its sole coupling to B. However, the effectiveness of the diffusion depends on the unstable nature of subsystem A and B. Therefore, the role of this degree of freedom in the effective environment is analyzed in detail
Lombardo Fernando C.
Villar Paula I.
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