Entanglement and the Question of Whether Anything Is Ever Truly Separate

[Ryan98]

Quantum entanglement is the phenomenon where two particles become linked in such a way that measuring one instantly tells you something about the other, no matter how far apart they are. Einstein famously called it spooky action at a distance and spent years trying to find a flaw in the theory, convinced that nature could not possibly work this way. Decades of experiments since have confirmed entanglement is real, repeatedly, with no signal travelling between the particles and no way to use the effect to send information faster than light, yet the correlation between them is undeniably there the moment you look.

The philosophical pull of entanglement is that it challenges one of the oldest assumptions in Western thought: that objects have well-defined, independent properties that exist whether or not anyone is looking. Entangled particles do not behave like two separate things that happen to be correlated. They behave more like a single system described by one unified mathematical object, even when the two particles are on opposite sides of a laboratory or, in principle, opposite sides of a galaxy. Some philosophers of physics describe this as a genuine challenge to the idea that the universe is fundamentally made of separate, local things bumping into each other, suggesting instead that relationships and connections might be more fundamental than the objects we usually think of as primary.

This idea has found an unexpectedly warm reception outside physics departments, in everything from contemplative traditions to popular science writing, partly because it offers a rigorously tested scientific basis for an intuition many people already hold: that separateness might be less fundamental to reality than it appears. Nobody is claiming quantum entanglement directly explains human connection or interdependence in any literal sense, the scales and mechanisms are entirely different, but the metaphor has proven durable precisely because the underlying physics genuinely does describe a universe where some things resist being fully separated, measured and understood in isolation from everything around them.

1804arxiv.org

[Di46]

Einstein being wrong about something this fundamental, after being right about so much else, is one of my favourite stories in the history of science. It is a reminder that even the greatest minds hit the edge of their own intuitions eventually

[Always_Myles26]

I love that entanglement has been experimentally confirmed across longer and longer distances over the decades, including satellite experiments, and the correlation just keeps holding up. At some point repeated confirmation has to count as one of the strongest results in all of science