Cavity quantum electrodynamics
In Chapter 7 we considered the absorption and emission of electromagnetic radiation when the interaction with the electromagnetic field was weak. However, it is possible to design cavities such that the interaction of atoms inside cavities with the cavity field would be strong. The interaction of an atom with the field in the cavity is essentially given by Eq. (7.6). We now write the quantized field as
Here the sum is over all the cavity modes ωα, uα() is the cavity mode function and V is the volume of the cavity. ...