Quantum mechanics is immune to the butterfly effect

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Strangely, quantum-mechanical systems seem to have the capacity to repair damage done in the past as time unfolds, a new paper suggests

’s science-fiction story “A Sound of Thunder”, a character time-travels far into the past and inadvertently crushes a butterfly underfoot. The consequences of that minuscule change ripple through reality such that, upon the time-traveller’s return, the present has been dramatically changed.

To perform their experiment, Drs Yan and Sinitsyn ran simulations on a small quantum computer made by. They constructed a simple quantum system consisting of “qubits”—the quantum analogue of the familiar one-or-zero bits used by classical computers. Like an ordinary bit, a qubit can be either one or zero. But it can also exist in “superposition”, a chimerical mix of both states at once.

They then checked to see how similar the final state of the chosen qubit was to the zero-state it had been assigned at the beginning of the experiment. The classical butterfly effect suggests that the researchers’ meddling should have changed it quite drastically. In the event, the qubit’s original state had been almost entirely recovered. Its state was not quite zero, but it was, in quantum-mechanical terms, 98.3% of the way there, a difference that was deemed insignificant.

 

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So, I do have hope. Phew.

There is no butterfly effect even in classic systems, especially the nonlinear chaotic ones since there are too many butterflies

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