The future of secure communication may hang in the balance, as quantum mechanics faces potential overhaul.

Ravishankar Ramanathan from the University of Hong Kong warns that quantum cryptography could be compromised if quantum theory itself is flawed. This paranoia is driven by the possibility that a more fundamental theory might one day replace our current understanding.

One way to fortify such systems, some scientists are exploring, is through 'jamming.' Quantum jamming involves subtly altering entangled particles without detection, potentially undermining trust in quantum-based security measures.

Michał Eckstein uses the tale of Alice and Bob, along with a magician named Jim, to illustrate this concept. In his story, Jim can alter entangled balls (representing particles) so that when they reunite, their colours match perfectly, revealing his interference.

This research challenges our understanding of causality and may lead to new methods of protecting against such 'jammers' in the future.