It is considered a system made by two noninteracting qubits, initially entangled, embeddedin zero-temperature bosonic independent environments. It is shown that differentforms of quantum correlations for two qubits can be expressed in terms of excitedstate population of each single qubit. These relations are explicitly given for both entanglementand Bell function. This permits to evidence regions where there is entanglementwithout violation of a Bell inequality, then showing that entanglement doesnot necessarily witness the presence of quantum correlations nonreproducible by a classicallocal model, as identified by Bell inequality violations.We finally report the explicit time dependence connection between quantum correlationsdynamics and spectral densities of the environments. To this purpose we shall examinesystems where non-Markovian features are relevant as in the case of cavity QEDsystems and of structured environments like photonic crystals.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2009|