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Quantum Entanglement: What It Actually Means and Why It Matters

@garagelab | 2026-05-13 07:20:24 |

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- What entanglement is (and isn't): When two particles are entangled, measuring one instantly determines the correlated property of the other — but this cannot transmit information faster than light (no FTL communication possible)
- Bell test experiments: John Bell's 1964 theorem gave physicists a way to test whether entanglement is "real" or just hidden variables — every experimental test since 1972 has confirmed genuine quantum entanglement with no local hidden variable explanation
- Quantum Key Distribution: BB84 protocol uses entangled photons to create cryptographic keys where any eavesdropping attempt collapses the quantum state — detecting the interception. Theoretically unbreakable by physics, not mathematics
- China's Micius satellite: In 2022 demonstrated entanglement-based QKD between ground stations 1,200km apart via satellite relay — crossing the atmospheric decoherence barrier that limits terrestrial fiber QKD to ~300km
- Quantum internet timeline: DARPA and EU Quantum Flagship are building metropolitan quantum networks in 2026-2030 — full intercontinental quantum internet likely requires 10-15 more years of quantum repeater development

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