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In the paper, he describes the various 'models' of photons that have come up over time including the corpuscular model, the singularity model, wave packet model and the QED model.

He lays stress on the fact that 'at present' (in 1989) the QED model seems to fit the bill quite well, in the sense that most of the phenomena observed can be explained using this model.

I wish to know what has changed in the last 20 years. Is the QED model still holding its ground.

Also, I've understood the QED model as that which postulates that interaction of light with matter as being quantized but the field or radiation itself is un-quantized/continuous. Have I understood it correctly?

Thanks,

Karthik