The qubit is able to take on multiple states at once, unlike the bit. This property I know is superposition, but is this property perpetual (always on) or optional (controlled to be on or off only when needed by an algorithm, such that when not needed, the qubit reverts to, or takes on the disguise of, a bit)?
and how does perpetual/optional superposition play into the notion of quantum parallelism: Does the qubit always execute parallel computations and incapable of a uni-sequential workflow, or can it be controlled to execute tasks in parallel only when the algorithm deems it necessary?
Essentially, what is the difference or connection between superposition and quantum parallelism and are these properties always active in a quantum algorithm?
(optional: Circuit diagrams that demonstrate example comparisons of "superposition/parallelism on" and "superposition/parallelism off" can be included as long as each item (line, gate and symbol) is annotated as a bullet point list.)