Hello all, I need some help... If I know the form of a wavefunction in the [itex] S_z [/itex] basis, say it is spin up, how do I convert that to a wavefunction expressed in the [itex] S_x [/itex] basis? Is there a very simple way to do this? Thanks
You've basically got it. To convert from S_{z} to S_{x}, you rotate the state vector p/2 rad about the y-axis.
Hi, I know this is old. Im sorry, but I have some confusion about this. I wonder, shouldn't the new state vector be a superposition of +x and -x? If I apply the rotation operator to my z state I get a pure state. Where has my thinking gone wrong?