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Two atoms exchanged a key over 100 km — eavesdropping ruled out by the laws of physics.
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Two single atoms exchanged a secret key through 100 kilometers of optical fiber. Quantum entanglement made eavesdropping impossible. This brings us closer to a quantum internet, shielded by the laws of physics.
🎯 Entangled particles behave exactly like paired coins: they land on the same side wherever you toss them, and peeking instantly changes them and exposes the intruder.
🎬 Sci-fi writers have long exploited this idea: in Ursula Le Guin's novels, the 'ansible' provides instant communication precisely through entangled particles.