physical interpretation of the "rotation" of a ket 1. The problem statement, all variables and given/known data No problem statement. I'm just having trouble imagining what it means to "rotate" a quantum -ket, especially since not all -kets are eigenstates of position. I know what the rotation operator is. I also can picture rotating a coordinate system in my head--that's easy of course. But what does it mean when a -ket is rotated? 2. Relevant equations see attached .pdf. they are notes i've taken from shankar p. 306-306. 3. The attempt at a solution see attached .pdf. they are notes i've taken from shankar p. 306-306.