On 8/8/2019 6:27 AM, Bruno Marchal wrote:
Let us use “superposition of state” instead. The word “world” has too much metaphysical implicit connotations. In that case, if the computer run a superposition similar to the initial calculation in Shor algorithm (before taking the final Fourier transform on all superposed results), decoherence means that all computations are done on the superposed state. That is the massive parallelism, than we can exploit through the final Fourier Transform and measurement.
It's "massive parallelism" only in that the state vector's evolution simultaneously has components along many different basis vectors. It's like saying a trajectory is massively parallel because it simultaneously has components in three dimensions.
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