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On a steep mountain slope, a single falling rock sometimes triggers an avalanche, and sometimes gets stuck. It all depends on the state of the slope.

Picture a vast hall where thousands of janitors are sweeping the floor at the same time. Each one knows only their own patch and sweeps debris toward the nearest wall, without asking a manager. It used to be thought that such an approach was impossible for a quantum computer: too many errors, and you need a central brain that sees the whole picture.