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I'm pretty good to go on the concept of a Bloch sphere, and would appreciate answers framed in those terms. I think we can agree that the internal "state" (before being read) of a qubit can be stated as a value for theta and phi in the Bloch sphere (so long as it's some "pure state").

My immediate question has to do with "moving" qubits. The no-cloning theorem states that they cannot be copied, so I will only talk in terms of "moving" them. Here's my question: Once the state of a qubit is moved from one qubit location to another, what's the state of the original location?

My "guess" is that it would be in a "fully mixed state" (i.e., the point at the very center of the Bloch sphere), but I'm not able to verify that.

I look forward to the replies,

Elroy