A single qubit is represented with a bloch sphere and implemented on an electron with only two energy values from lots of them.
So, I am confused about why an energy range is represented as a vector on a sphere, and also with the relation between the spin vector from Dirac or Pauli equation and the Bloch Vector. I think the first is a SO3 vector on real space, and the bloch one is SU2 on internal space. So Bloch sphere is not the real spin?
When we rotate that spin with microwaves are we rotating the real spin?
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Luis ALberto
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