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Causality: Why It Can't Be Measured ⚡ экспресс

Original: "Causal Order Cannot Be An Observable"
· Declan Maguire, Fabio Costa
arXiv:2605.25302 · 2026-05-24 · CC BY · ⏱ 1 min · Quantum Physics General Relativity
Scientists have proven that in the quantum world, the order of events cannot be measured like weight or speed.
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In the quantum world, cause and effect can swap places. Scientists have proven that this order of events cannot be measured like an ordinary quantity—it behaves differently than spin or charge. This discovery changes our perception of reality.

🎯 In the quantum world, you can create a situation where event A causes event B, and at the same time B causes A. This is called a quantum switch.

Scientists
Christian DopplerD. B. McLaughlinDidier QuelozMichel MayorR. A. RossiterStephen Hawking
Tags
entropy speed of light black hole
Laws
second law of thermodynamicsDoppler effectHawking radiationgravitational lensingprinciple of constancy of the speed of lightBekenstein-Hawking entropy
Original: arXiv:2605.25302 · CC BY · bridge42worlds