Re: physicists ask photons where they've been
David Deutsch <david.deutsch-LR/[email protected]> Sun, 5 Jan 2014 18:57:29 +0000
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<p><div id="ygrps-yiv-1861210825">On 30 Nov 2013, at 15:23, Lee Corbin wrote:<br>
<br>
> Hi everyone,<br>
> <br>
> and especial hello to any old friends who remember me from 7-8 years back or <br>
> so.<br>
> <br>
> Wanting to get back in the swing of things, find out what's the buzz (tell <br>
> me what's happening), and also pose some questions, let me start by asking <br>
> if anyone's read about the evidently new experiment described in<br>
> <br>
> http://physicsworld.com/cws/article/news/2013/nov/26/physicists-ask-photons-where-have-you-been<br>
> <br>
> Ultimately, I would like to understand the experiment better (I'll say below <br>
> what I already know), and see if the result can be straightforwardly <br>
> explained in the MWI view.<br>
<br>
It's not a straightforward experiment!<br>
<br>
But yes, its interpretation under the Everett interpretation is no different in principle from that of any other interference experiment.<br>
<br>
By the way, Lev Vaidman is one of the most creative and innovative theorists working on the foundations of quantum theory, and an advocate of the Everett interpretation. He and I differ on the way probability arises in quantum theory. Also he's enthusiastic about 'weak measurement' theory (which is what this experiment is supposed to illustrate), which I haven't yet seen the point of. But there's nothing in that theory or the experiment that contradicts quantum theory or tests the Everett interpretation.<br>
<br>
-- David Deutsch<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br></div></p>
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