Physics
Bell's Theorem
Quick fact
Bell's theorem proved that quantum mechanics cannot be explained by hidden variables that operate locally.
Why this is interesting
Imagine two dice that are mysteriously linked, no matter how far apart they are. Bell's theorem reveals the strange truth about this connection.
Read the full explanation
Understanding Bell's Theorem
Bell's theorem shows that particles can be connected in such a way that their properties are not determined until measured, even if they’re far apart. This challenges the idea that physical reality is made of separate, predictable parts.
A deeper explanation
Bell’s theorem reveals that quantum mechanics violates what we call 'local realism'—the idea that objects have definite properties and influences can’t travel faster than light. By analyzing correlations between entangled particles, Bell showed that no local hidden variable theory could replicate quantum predictions, proving the non-local nature of quantum reality.