The time-flipped photon can't be used to restage 'Back to the Future,' but it could help us figure out some of the universe's most mysterious phenomena.
For the first time, physicists have made light appear to move simultaneously forward and backward in time. The new technique could help scientists improve quantum computing and understand quantum gravity.
By combining these two principles, the physicists produced a photon that appeared to simultaneously travel along and against the arrow of time. They published the results of their twin experiments Oct. 31 and Nov. 2 on the preprint server arXiv, meaning the findings have yet to be peer-reviewed. The second law of thermodynamics states that the entropy of a system, a rough analogue of its disorder, must increase. Known as the"arrow of time," entropy is one of the few quantities in physics that sets time to go in a particular direction.
The other factor at play in the new experiments is superposition. The most famous demonstration of quantum superposition is Schrödinger's cat, a thought experiment in which a cat is placed inside a sealed box with a vial of poison whose release is triggered by the radioactive decay of an alpha particle.
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