The quantum world operates according to different rules than the classical macroscopic world around us, making the impossible possible. Physicists plan to use quantum entanglement to model a closed time curve, which essentially means time travel. The recent study was a theoretical experiment, meaning there were no quantum particles going back in time. However, the proposed simulation involves “effective time travel” due to the specific way in which quantum particles interact. This interaction is called quantum entanglement. This means that knowing the properties of one entangled particle will give you information about another particle, regardless of the distance between them. Space is vast and time is relative, so swapping a quantum particle on entangled Earth with a nearby particle from a black hole 10 billion light years away could alter the behavior of a objects in the distant past.

The study examines the possibility of the closing time curve (CTC) as a hypothetical path back in time. Although Stephen Hawking argued that the laws of physics do not allow for the existence of closed CTCs, the authors of a recent study wrote that they could be simulated using quantum teleportation circuits. The essence of the experiment is as follows: physicists carry out quantum interaction with photonic sensors, obtaining a certain measurable result. Researchers can adjust the values ​​of the quantum sensor through entanglement, thus obtaining better results even after the operation has taken place. The team demonstrates that it’s “possible to improve on your previous choices,” although the proposed time travel simulation has yet to be performed as a real-world test.

In their study, the apparent time travel effect occurred one in four times. To eliminate the high failure rate, the team proposed sending a large number of entangled photons. The experiment we describe appears to be unsolvable using standard (non-quantum) physics, subject to ordinary time. – David Arvidsson-Sukur, quantum physicist at the University of Cambridge and lead author of the study A real-world test of this idea has yet to be carried out, so the reality may be very different. Perhaps this will lead to new discoveries about quantum reality.

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