C2c2

c2c3

c2c4

fai aS

C3C1

c3c2

c3 c3

c3c4

faIfaS

C4C1

c4c2

c4c3

c4c4

If the average is taken over all of the spin pairs in the sample for each term in the matrix, we have the density matrix a that describes the state of the whole system. The superpositions (or coherences) between states can be described as follows:

0 0

Post a comment