Imagine a blender that whips, bakes, and fries all at once. In the quantum world, cause and effect can mix in the same way — and scientists have proved it for the first time without trusting the instruments, just by looking at the outcome. This device-independent test opens the door to unhackable quantum technologies.
🎯 Schrödinger's famous cat is both alive and dead at the same time. Now add time confusion: that same cat eats dinner either before or after its walk — depending on how time turns out.
🎬 Sci-fi writers have often played with the confusion of past and future: in Ted Chiang's 'Story of Your Life,' knowledge of the future changed the past. The quantum switch shows that for particles, such confusion is routine.