Re: Why can a photon only interfere with itself across multiple universes but not with other photons in the same universe?

Gary Oberbrunner <[email protected]> Mon, 6 Jan 2014 10:28:34 -0500
Newsgroups	gmane.science.physics.fabric-of-reality
Message-ID	<CAFChFyis6XTMb5nyi3BaRKkZ8J=sWph=MYjLEcR99Wyt_jn+zA@mail.gmail.com>
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On Mon, Jan 6, 2014 at 9:05 AM, <[email protected]> wrote:

> This is something that has bugged me for a while:
>
>
> Why can a photon only interfere with itself across multiple universes
> (interference), but can't interact with other photos in the same universe?
>  i.e, why don't two photons interact when fired directly at each other?,
> and yet the same photon can interfere with itself across multiple universes?

Great question!

Those two photons are completely uncorrelated; their state vectors are orthogonal so they can't interact.  They go right through each other.  To see this simply, notice that their phases will be random and their frequencies may be ever so slightly different even if they come from the same source.

-- 
Gary


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      <p>On Mon, Jan 6, 2014 at 9:05 AM, &lt;[email protected]&gt; wrote:<br>
<br>
&gt; This is something that has bugged me for a while:<br>
&gt;<br>
&gt;<br>
&gt; Why can a photon only interfere with itself across multiple universes<br>
&gt; (interference), but can&#39;t interact with other photos in the same universe?<br>
&gt;  i.e, why don&#39;t two photons interact when fired directly at each other?,<br>
&gt; and yet the same photon can interfere with itself across multiple universes?<br>
<br>
Great question!<br>
<br>
Those two photons are completely uncorrelated; their state vectors are orthogonal so they can&#39;t interact.  They go right through each other.  To see this simply, notice that their phases will be random and their frequencies may be ever so slightly different even if they come from the same source.<br>
<br>
-- <br>
Gary<br>
<br>
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