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Quantum histories get all tangled up

Tracing a particle’s past requires multiple chronologies, physicists say

1:00pm, January 25, 2016
forking road graphic

TEMPORAL FORK  When there’s a fork in the road, nature may take Yogi Berra’s advice and take it. A new experiment suggests that reality can split into multiple intertwined timelines, a phenomenon termed “entangled histories.”

Choose Your Own Adventure books are fun, but they let readers choose only one version of events at a time. Quantum mechanics, a new experiment suggests, requires that multiple adventures occur simultaneously to create a consistent account of history.

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