In the quantum world, does effect come before cause? Maybe not.
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Causes come first, effects come later – but is that really the case? This order of events has long been upended in the quantum world, where A can simultaneously cause B, and B can cause A. But new mathematical analysis suggests that this quantum quirk may be limited by the very fabric of space-time.
For over a decade, physicists have been grappling with the concept of indeterminate causal order, which is a case in which it is impossible to determine when a cause occurred…
