Quantum eavesdropping could work even from inside a black hole

Quantum eavesdropping is possible across a black hole’s event horizon, one of the most impermeable cosmic boundaries – at least in one direction.

Daine Danielson at the University of Chicago, Illinois, wanted to know how the structure of space-time, the fabric of our reality, influences quantum objects. This led him and his colleagues to a thought experiment where two people, Alice and Bob, end up separated by one…