A causal loop is when something brings about its own existence – it has no definite origin spot in the timeline. For example, suppose you come across a Time Machine in an old abandoned mine.

A causal loop is a classic time travel conundrum. If you send information to the past – say, you give Albert Einstein the formula E=mc ² before he theorises it himself, then he publishes it and ...

Quantum causal loops. Université libre de Bruxelles. Journal Nature Communications DOI 10.1038/s41467-020-20456-x ...