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Quantum Switch Breaks the Usual Flow of Time ⚡ экспресс

Original: "Experimental device-independent certification of indefinite causal order"
arXiv:2508.04643 · 2025-08-06 · CC BY 4.0 · ⏱ 1 min · Quantum Physics
Physicists have proven that cause and effect can swap places — and you don't have to trust the instruments to see it.
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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.

Scientists
Christian DopplerD. B. McLaughlinDidier QuelozMichel MayorR. A. RossiterAlbert Einstein
Tags
spacetime curvature speed of light entropy
Laws
second law of thermodynamicsDoppler effectprinciple of constancy of the speed of lightBekenstein-Hawking entropymass–energy equivalenceMaxwell's equations
Original: arXiv:2508.04643 · CC BY 4.0 · bridge42worlds