On 4/19/2016 6:00 AM, spudboy100 via Everything List wrote:
Brent, to be more precise, I was thinking that every photon event staring from 1 nanosecond ago, on backwards, might still be floating around somewhere.
The photons may have been interacted with atoms and lost, but if QM is strictly unitary the information still exists in principle - it's just inaccessible FAPP.
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