A ‘beyond-quantum’ equivalence principle for superposition and entanglement

The physics of the microrealm involves two famous and bizarre concepts: superposition and entanglement. Both are described mathematically by quantum theory, but many physicists believe that one day quantum theory will need to be replaced by an ultimate theory of reality that lies beyond quantum theory. Now, a team of physicists and mathematicians has discovered a new connection between these two weird properties that does not assume that quantum theory is correct. Their work, partially funded by the Foundational Questions Institute, FQXi, confirms that current quantum cryptographic protocols, which promise ultra-secure un-hackable...

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