Explanation of last action: We are using the notation (n-, n+) to represent a state of 1mag , where n- is the number of spin - particles and n+ is the number of spin + particles. Node nz+ has 2 states, 0 and 1, where the numbers 0 and 1 tell how many particles of spin + go through node nz+ . By setting to 1 the amplitude of nz+ =0 when 1mag = (0,0), what we are saying is that with unit amplitude, when 1mag =(0,0), zero particles of spin + traverse node nz+ .
Press the OK button. Now scan over the 3 possible input states of 1mag by pressing successively the Next button of the Parent Nodes box. You'll see that the Amplitudes box contains new amplitudes for each of the input states.
Press the OK button. Now scan over the 4 possible input states of 2mag by pressing successively the Next button of the Parent Nodes box. You'll see that the Amplitudes box contains new amplitudes for each of the input states.