Can photons reach back in time?
SMRTR summary
Kim et al.'s 1999 delayed-choice quantum eraser experiment investigated the nature of quantum entanglement and wave-particle duality. The study found that observing which path a photon took through a double-slit apparatus appeared to retroactively determine its earlier behavior, suggesting information traveling backwards in time. However, this interpretation likely stems from misunderstanding the wave nature of light and quantum systems rather than actual retrocausality.
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