Physics – Quantum Physics
Scientific paper
2003-09-02
Physics
Quantum Physics
12 pages, 3 figures
Scientific paper
10.1103/PhysRevA.69.052111
A characteristic action $\Delta S$ is defined whose magnitude determines some properties of the expectation value of a general quantum displacement operator. These properties are related to the capability of a given environmental `monitoring' system to induce decoherence in quantum systems coupled to it. We show that the scale for effective decoherence is given by $\Delta S\approx\hbar$. We relate this characteristic action with a complementary quantity, $\Delta Z$, and analyse their connection with the main features of the pattern of structures developed by the environmental state in different phase space representations. The relevance of the $\Delta S$-action scale is illustrated using both a model quantum system solved numerically and a set of model quantum systems for which analytical expressions for the time-averaged expectation value of the displacement operator are obtained explicitly.
Alonso Daniel
Brouard S.
Mayato Rafael Sala
Palao Jose P.
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