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Quantum Optics by Girish S. Agarwal

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16

Decoherence and disentanglement in two-level systems

In Chapters 1115 we discussed how coherence in atomic systems can be produced by using coherent driving fields. Furthermore, we have discussed how quantum entanglement can be produced by near field radiative effects. Clearly the applications of coherence and entanglement require that these characteristics should survive over the scale of time at which applications would be carried out. However, all systems are subject to interaction with the environment (Chapter 9). The interaction is typically determined by two time scales T1 and T2. These time scales also determine the scale over which coherence and entanglement would survive.

In this chapter, we discuss both loss of coherence and entanglement ...

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