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Nov 15, 2020 at 5:11 comment added Himanshu When you didn't change the operator that's what you call the active transformation that's the case for which I have given explanation. But you can do the same with passive transformation where the transformation will change. I hinted on last paragraph.
Nov 15, 2020 at 4:19 comment added Jeff I think the key thing here is that Ballentine wants to perform a transformation on a state vector but not change any of the observables. I think that is what you were alluding to with keeping the eigenvectors on the same line under the rotation.
Nov 15, 2020 at 0:22 comment added Jeff It still isn't wholly satisfying for me. The position observable, $X$, has eigenvectors for every point in space. So if you do a space translation by $\mathbf{a}$, of $|x\rangle$, $|x'\rangle = |x+a\rangle$. But, Ballentine is insisting that one also translates the position operator $X$.
Nov 14, 2020 at 21:11 vote accept Jeff
Nov 14, 2020 at 21:11
Nov 14, 2020 at 20:26 history answered Himanshu CC BY-SA 4.0