- #1
jk22
- 729
- 24
EPRB is a know reasoning about the singlet state.
However if we apply this to the triplet state [tex]\frac{1}{\sqrt{2}}(\mid+-\rangle+\mid-+\rangle)[/tex].
we find the following :
suppose we measure spin A with result +, then spin B is - (we see this by the projection on the possible state), however it's a state with total spin 1, since this triplet state is eigenvector of the sum operator (S1+S2)^2.
So we fing that the following is different : measuring spin A and then spin B and making the sum,
or making the measurement of the sum. How does the system know in advance the sum will be taken ?
However if we apply this to the triplet state [tex]\frac{1}{\sqrt{2}}(\mid+-\rangle+\mid-+\rangle)[/tex].
we find the following :
suppose we measure spin A with result +, then spin B is - (we see this by the projection on the possible state), however it's a state with total spin 1, since this triplet state is eigenvector of the sum operator (S1+S2)^2.
So we fing that the following is different : measuring spin A and then spin B and making the sum,
or making the measurement of the sum. How does the system know in advance the sum will be taken ?