Bell's Theorem for Temporal Order

Understand

Time has a fundamentally different character in quantum mechanics and in general relativity.

• In quantum theory events unfold in a fixed time order while in general relativity temporal order is influenced by the distribution of matter.
• When the distribution of matter requires a quantum description, temporal order is expected to become non-classical -- a scenario beyond the scope of current theories.
• Here we provide a direct description of such a scenario.