Fig. 5. Quantum Parallelism: A quantum computer acts
like a multi-port interferometer, operating simultaneously
on many classical outcomes. Shown here is a schematic of a
three qubit system which can encode 8 possible outcomes (0-7).
Interference between paths, driven by the quantum algorithm,
leads to constructive interference for the desired answer to a
computational problem (here 0), which can then be read
out with high probability.

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