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Quantum Optics by Girish S. Agarwal

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8

Partial coherence in multimode quantum fields

We have so far mostly concentrated on one or two modes of electromagnetic fields. We have discussed a variety of field states, some of which have unusual quantum properties. In general, a radiating source will produce a multimode field. We have already seen two examples of physical systems where the produced fields are genuinely multimode. These examples are (i) parametric downconverters (Chapter 3) and (ii) spontaneous emission by an atom (Chapter 7). Besides knowing the state of the multimode field, we would also like to know the kind of observables that one can introduce to characterize a multimode field. In addition, we would like to find the experimental schemes to measure these observables. ...

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