- #1

- 441

- 2

|1,1> = |+>|+>

|1,0> = (|+>|-> + |->|+>) / sqrt(2)

|1,-1> = |->|->

|0,0> = (|+>|-> - |->|+>) / sqrt(2)

Now, why the Fock space of the interacting theory in QFT can't be spanned by the non-interacting states i.e. why the interaction and non-interaction Fock spaces are not the same?