75 years of entanglement

Though it has been confirmed numerous times since 1935, entanglement is as spooky as ever.

1935: Physicists Albert Einstein, Boris Podolsky and Nathan Rosen publish a paper in Physical Review asking “Can quantum-mechanical description of physical reality be considered complete?” Their answer: no.

The same year, in the journal Naturwissenschaften, Erwin Schrödinger coins the term Verschränkung, meaning “entanglement,” and develops his famous thought experiment of a cat that exists simultaneously in a state of being alive and dead.

1952: Building on earlier work by French physicist Louis de Broglie, theoretical physicist David Bohm suggests a deterministic interpretation of quantum theory that incorporates “hidden variables.” He claims that the initial state of a system, like a particle’s position, can determine its future evolution.