Blue Butterfly

The Quantum Butterfly Noneffect

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+  The butterfly effect is well accepted in our everyday world, where classical physics describes systems above the atomic scale. But in the submicroscopic world where quantum mechanics reigns, different—and very strange—rules apply. Does the butterfly effect still hold true? If not, what happens instead?

You could say reality in quantum mechanics is self-healing.


+  To our surprise, we not only disproved the butterfly effect in a quantum system, but we also found a sort of no-butterfly effect, as if the system wants to protect the present.

+  Our theory applies to a sufficiently complex quantum evolution in which quantum correlations among the different qubits have time to appear during the backward-in-time evolution. This approach has practical applications, such as testing the quantumness of quantum computers. Where it is uncertain whether a quantum computer is actually using quantum mechanics to get its results—it might still be relying on classical physics—our no-butterfly effect can be used to test it, because our effect is purely quantum mechanical. Another potential application is protecting information, since a random evolution on a quantum circuit can protect a qubit from attack.

Image: Pixabay Article Source:  Scientific American.  Nikolai Sinitsyn, Bin Yan,  The Quantum Butterfly Noneffect…

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