“It’s not the job of the theorist to defend his model at all costs!” – Joel Primack
One of the more puzzling phenomena in our quantum Universe is that of entanglement: two particles remain in mutually indeterminate states until one is measured, and then the other — even if it’s across the Universe — is immediately known.
In theory, this should be true even if one member of the pair falls into a black hole, although it’s impossible to measure that. However, we can (and have) measured that for the laboratory analogue of black holes, known as “dumb holes,” and the entanglement survives!
Go read the full story of how quantum entanglement survives, even across an event horizon, thanks to Sabine Hossenfelder over at Forbes!