Quantum entanglement is the strangest, most well-verified phenomenon in physics. When two particles become entangled, their properties remain perfectly correlated no matter how far apart they travel β even if separated by the entire width of the universe.
Albert Einstein, deeply uncomfortable with this idea, called it "spooky action at a distance". He believed there must be hidden variables explaining the correlation. Decades of experiments β including Nobel Prize-winning work by John Clauser, Alain Aspect, and Anton Zeilinger in 2022 β confirmed that no such hidden variables exist. Entanglement is real.
What It Doesn't Do
Despite the headlines, entanglement cannot transmit information faster than light. The correlations are only revealed when both parties compare results through ordinary (light-speed-limited) communication.
What It Can Do
- Power quantum computers that solve certain problems exponentially faster than classical computers
- Enable quantum cryptography that is impossible to eavesdrop on
- Allow quantum teleportation β transferring a particle's quantum state across vast distances
- Help build a future quantum internet
In 2017, Chinese scientists used the Micius satellite to demonstrate entanglement between particles on the ground separated by 1,200 kilometers. The connection held perfectly.
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