Experimental Entanglement of Temporal Order

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First demonstration of indefinite temporal order outside quantum formalism, showing experimental outcomes that rule out a class of generalized probabilistic theories assuming locality and definite temporal order. Two photonic entangled quantum switches inject separable target polarizations (input fidelity 0.935, concurrence ≈0.001) while an entangled control transfers order-dependent entanglement to targets; a Bell-like test yields a violation 2.55±0.08 (≈7σ). Results apply to three-dimensional Bloch-type GPTs, not all post‑quantum theories.

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1. 0:00Introduction
2. 3:37Field of indefinite causality
3. 5:22A definite causal structure
4. 6:17indefinite causal structure
5. 7:41experiments in indefinite causality
6. 13:32presentation
7. 14:30novel theorem
8. 16:42the entangled quantum switch
9. 22:51the nugget theorem
10. 23:23experiment setup
11. 25:42bell test
12. 27:29separability
13. 28:31joint probabilities
14. 40:27additional tests
15. 40:59sanity check
16. 41:34conclusion
17. 44:09indefinite causal order