阿摩線上測驗
題組內容
15. (20 pts) Consider the spin state of a proton. Recall that the spin operators are
where i =
. Suppose that a static external magnetic field is applied along the y direction, so that the hamiltonian is 
where B is the magnetic field strength, and
is a real constant. Denote the spin up state a and the spin down stateβ as