“Whether closed timelike curves exist in reality, we don’t know.'
The quantum world operates by different rules than the classical one we buzz around in, allowing the fantastical to the bizarrely normal. Now, a team of physicists has used quantum entanglement to simulate a closed timelike curve—in layman’s terms, time travel. Before we proceed, I’ll stress that this was simulated; no quantum particles went back in time.
“The experiment that we describe seems impossible to solve with standard physics, which obeys the normal arrow of time,” said David Arvidsson-Shukur, a quantum physicist at the University of Cambridge and the study’s lead author, in an email to Gizmodo. “Thus, it appears as if quantum entanglement can generate instances which effectively look like time travel.
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