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This quirky phenomenon, famously described by Albert Einstein as "spooky action at a distance," holds that particles can know one another's state -- for example, their spin direction -- even when they are separated by a great distance.

The Bell theorem refers to how entangled electrons are predicted by quantum mechanics, making them non-local — often referred to as “spooky action at a distance.”

Albert Einstein called it “spooky action at a distance”.

This connection between the photons was established through quantum entanglement, often referred to as 'spooky action at a distance', enabling particles to influence each other's measurement outcomes even when separated by significant distances.

Last year, Alain Aspect, John Clauser and Anton Zeilinger won the prize for work on quantum entanglement, where two particles are linked regardless of the space between them, something that unsettled Einstein himself who once referred to it as "spooky action at a distance".