Quantum speedups arise from engineered interference in high-dimensional Hilbert spaces rather than classical branchwise parallelism, constrained by no unitary garbage erasure, contextuality, and absence of absorbing halting states in closed unitary dynamics.
Hewitt-Horsman, An introduction to many worlds in quantum computation, Foundations of Physics39, 869 (2009)
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The Physical and Contextual Limits of Quantum Speedup
Quantum speedups arise from engineered interference in high-dimensional Hilbert spaces rather than classical branchwise parallelism, constrained by no unitary garbage erasure, contextuality, and absence of absorbing halting states in closed unitary dynamics.