There are many news stories about recent Steinbereg experiment ( Preprint Experimental evidence that a photon can spend a negative amo...
), I haven't seen any discussion on ResearchGate, so let me start one.They shoot single photon-like pulses into Rb atoms in magneto-optic trap, which are also probed with continuous wave - for which they measure change of phase - getting response before and after the pulse, both with and without postselection based on later observation of such photon-like pulse.
As clearly there is also earlier response without postselection, why information cannot be sent this way?
Does photon really spend negative time there? How to understand it?
Personally I suspect ( Preprint Testing stimulated emission photon direction
) this is rather stimulated emission instead - which seems CPT analog of absorption, hence should have opposite delay sign (?)- Badges
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