> There is not good evidence (that I know of at least, maybe I will learn some) that the actual EM field is quantised. Yes, there is: we can make Fock states o

> There is not good evidence (that I know of at least, maybe I will learn some) that the actual EM field is quantised. Yes, there is: we can make Fock states of the EM field in the laboratory. Such states can only exist if the EM field is quantized. More generally, phenomena like bunching and antibunching are only possible if the EM field is quantized. Quantization of matter alone is not enough.