&gt; I am not sure that this is correct.<p>&lt;sigh&gt;  So you&#x27;re smarter than every physicist alive.<p>Well... no.<p>&gt; One can now argue whether that change should be called information ...<p>No, you can&#x27;t.  You&#x27;re using colloquial English to reason about physics.  This is wrong.  Physicists have a very specific definition for &quot;information&quot; (as I already said, and you ignored).  And in this case, no information is exchanged.<p>&gt; That is pretty vague and might or might not be true.<p>As the published nuclear physicist in the argument... yes, yes, it&#x27;s true.<p>&gt; Do you mean every information exchanges between two spatially separated parties necessarily requires the exchange of (real) particles?<p>Yes.