benbenny
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It is my understanding that a measurement of S_z followed by a measurement of S_y will result in a particle which is in an eigenstate of S_y. But it appears that a measurement of say S_y followed by a measurement of S_x results in zero. I see this from a question in which I am asked to find the expectation value of S_x for a particle in an eigenstate of S_y and my result is zero. But for S_z it is non zero.
I don't understand why this is so. Could someone help me understand why we find non zero S_z values but zero S_x values for a partilce in an S_y eigenstate.
Thanks in advance.
B
I don't understand why this is so. Could someone help me understand why we find non zero S_z values but zero S_x values for a partilce in an S_y eigenstate.
Thanks in advance.
B