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	<title>Comments for Matt Leifer</title>
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	<link>http://mattleifer.info</link>
	<description>Mathematics -- Physics -- Quantum Theory</description>
	<lastBuildDate>Sun, 13 May 2012 20:04:27 +0000</lastBuildDate>
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		<title>Comment on Can the quantum state be interpreted statistically? by A boost for quantum reality - Page 3 - Parapsychology and alternative medicine forums of mind-energy.net</title>
		<link>http://mattleifer.info/2011/11/20/can-the-quantum-state-be-interpreted-statistically/comment-page-2/#comment-2981</link>
		<dc:creator>A boost for quantum reality - Page 3 - Parapsychology and alternative medicine forums of mind-energy.net</dc:creator>
		<pubDate>Sun, 13 May 2012 20:04:27 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17322#comment-2981</guid>
		<description>[...] Found the best write-up I&#039;ve seen to date, as far as getting the PBR &quot;theorem&quot; across as simply as possible. It&#039;s better than the older one I posted right before this one, imo.  Can the quantum state be interpreted statistically? &#124; Matt Leifer [...]</description>
		<content:encoded><![CDATA[<p>[...] Found the best write-up I&#039;ve seen to date, as far as getting the PBR &quot;theorem&quot; across as simply as possible. It&#039;s better than the older one I posted right before this one, imo.  Can the quantum state be interpreted statistically? | Matt Leifer [...]</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by mleifer</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2878</link>
		<dc:creator>mleifer</dc:creator>
		<pubDate>Wed, 25 Apr 2012 10:20:59 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2878</guid>
		<description>Yes, but this requires the factorization assumption used by PBR.  At the time of writing, I was hopeful that we could prove the PBR theorem without factorization, but now I know that this is not possible.  Therefore, the standard Bell-inequality arguments are still preferable as they involve one less assumption.

BTW, this is not something I &quot;believe&quot;, but rather something that Spekkens and Harrigan have proved.</description>
		<content:encoded><![CDATA[<p>Yes, but this requires the factorization assumption used by PBR.  At the time of writing, I was hopeful that we could prove the PBR theorem without factorization, but now I know that this is not possible.  Therefore, the standard Bell-inequality arguments are still preferable as they involve one less assumption.</p>
<p>BTW, this is not something I &#8220;believe&#8221;, but rather something that Spekkens and Harrigan have proved.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by Kon</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2877</link>
		<dc:creator>Kon</dc:creator>
		<pubDate>Wed, 25 Apr 2012 04:09:43 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2877</guid>
		<description>Hi Matt,

Do you still believe that PBR directly implies non-locality, without Bell&#039;s as I think you argued in a section of Quantum Times article?

&quot;It (PBR) provides a simple proof of many other known theorems, and it supercharges the EPR argument, converting it into a rigorous proof of nonlocality that has the same status as Bell’s theorem. &quot;

 Thanks.</description>
		<content:encoded><![CDATA[<p>Hi Matt,</p>
<p>Do you still believe that PBR directly implies non-locality, without Bell&#8217;s as I think you argued in a section of Quantum Times article?</p>
<p>&#8220;It (PBR) provides a simple proof of many other known theorems, and it supercharges the EPR argument, converting it into a rigorous proof of nonlocality that has the same status as Bell’s theorem. &#8221;</p>
<p> Thanks.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by Glenn Gould has no Tempo</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2795</link>
		<dc:creator>Glenn Gould has no Tempo</dc:creator>
		<pubDate>Tue, 27 Mar 2012 20:02:19 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2795</guid>
		<description>How do you receive messages from the future? Do you have to wear special hats?</description>
		<content:encoded><![CDATA[<p>How do you receive messages from the future? Do you have to wear special hats?</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by Paul Is Cool</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2786</link>
		<dc:creator>Paul Is Cool</dc:creator>
		<pubDate>Mon, 26 Mar 2012 19:41:19 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2786</guid>
		<description>The block universe is more extravagant than contextual realism.</description>
		<content:encoded><![CDATA[<p>The block universe is more extravagant than contextual realism.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by Peter Morgan</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2781</link>
		<dc:creator>Peter Morgan</dc:creator>
		<pubDate>Mon, 26 Mar 2012 13:25:30 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2781</guid>
		<description>&quot;Skincares parity&quot;&#039;s comment prompts me to suggest that retrocausality is a Metaphysical idea insofar as it is used as part of a model of individual cases, whereas the experimental support for Physics, since 1900, say, is only for statistical models. Experimental support for non-statistical models seems unlikely to me, though that may be just imagination failure (deBB falls at the same hurdle).

On the argument in &quot;Skincares parity&quot;&#039;s comment, however, future and past doesn&#039;t necessarily correlate with empirical verification of models (to remove the word &quot;prediction&quot;, which suggests such a correlation is necessary). Taking prediction to be more valuable than verification is just experimentalists&#039; way of preferring some level of blindness.

I don&#039;t have access to the experimental evidence that Everyone is Paul! Paul needs to get several computers, e-mail addresses, and/or establish a few proxies if he (wolf? grandma?) wants to deceive, although Matt&#039;s responses are laudably engaged with the ideas in the comments, crazy or not, IMO. I had just been thinking that the names in this comment thread were approaching meltdown.</description>
		<content:encoded><![CDATA[<p>&#8220;Skincares parity&#8221;&#8216;s comment prompts me to suggest that retrocausality is a Metaphysical idea insofar as it is used as part of a model of individual cases, whereas the experimental support for Physics, since 1900, say, is only for statistical models. Experimental support for non-statistical models seems unlikely to me, though that may be just imagination failure (deBB falls at the same hurdle).</p>
<p>On the argument in &#8220;Skincares parity&#8221;&#8216;s comment, however, future and past doesn&#8217;t necessarily correlate with empirical verification of models (to remove the word &#8220;prediction&#8221;, which suggests such a correlation is necessary). Taking prediction to be more valuable than verification is just experimentalists&#8217; way of preferring some level of blindness.</p>
<p>I don&#8217;t have access to the experimental evidence that Everyone is Paul! Paul needs to get several computers, e-mail addresses, and/or establish a few proxies if he (wolf? grandma?) wants to deceive, although Matt&#8217;s responses are laudably engaged with the ideas in the comments, crazy or not, IMO. I had just been thinking that the names in this comment thread were approaching meltdown.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by mleifer</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2780</link>
		<dc:creator>mleifer</dc:creator>
		<pubDate>Mon, 26 Mar 2012 12:50:51 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2780</guid>
		<description>Paul,

Wordpress is smart enough to know that all these people are you.

I think that retrocausality only makes sense in a &quot;block universe&quot; approach, in which X exists regardless of whether it is in the past or the future.  See http://en.wikipedia.org/wiki/Eternalism_(philosophy_of_time)</description>
		<content:encoded><![CDATA[<p>Paul,</p>
<p>WordPress is smart enough to know that all these people are you.</p>
<p>I think that retrocausality only makes sense in a &#8220;block universe&#8221; approach, in which X exists regardless of whether it is in the past or the future.  See <a href="http://en.wikipedia.org/wiki/Eternalism_(philosophy_of_time)" rel="nofollow">http://en.wikipedia.org/wiki/Eternalism_(philosophy_of_time)</a></p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by Skincares Parity</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2776</link>
		<dc:creator>Skincares Parity</dc:creator>
		<pubDate>Mon, 26 Mar 2012 03:30:52 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2776</guid>
		<description>If I understand Maybe Your Baby, if X is going to retrocausally affect the past, then X must exist. But X doesn&#039;t exist until the future. Therefore, if you are going to make a prediction about the future, you must already be in the future. But then it&#039;s not a falsifiable prediction.</description>
		<content:encoded><![CDATA[<p>If I understand Maybe Your Baby, if X is going to retrocausally affect the past, then X must exist. But X doesn&#8217;t exist until the future. Therefore, if you are going to make a prediction about the future, you must already be in the future. But then it&#8217;s not a falsifiable prediction.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by mleifer</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2773</link>
		<dc:creator>mleifer</dc:creator>
		<pubDate>Mon, 26 Mar 2012 00:00:38 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2773</guid>
		<description>Re: the direction of time -- There can still be a thermodynamic arrow of time based on an asymmetry between past and future boundary conditions.</description>
		<content:encoded><![CDATA[<p>Re: the direction of time &#8212; There can still be a thermodynamic arrow of time based on an asymmetry between past and future boundary conditions.</p>
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		<title>Comment on Quantum Times Article on the PBR Theorem by mleifer</title>
		<link>http://mattleifer.info/2012/02/26/quantum-times-article-on-the-pbr-theorem/comment-page-1/#comment-2772</link>
		<dc:creator>mleifer</dc:creator>
		<pubDate>Sun, 25 Mar 2012 23:59:02 +0000</pubDate>
		<guid isPermaLink="false">http://mattleifer.info/?p=17354#comment-2772</guid>
		<description>PBR does not say anything about this.  It says there are an infinite number of ontic states, i.e. states that exist in reality independent of any minds, for even a qubit.  It is a theorem about observer independent realist theories, i.e. exactly the sort of theories that avoid talking about minds, so it can&#039;t really say anything about them.</description>
		<content:encoded><![CDATA[<p>PBR does not say anything about this.  It says there are an infinite number of ontic states, i.e. states that exist in reality independent of any minds, for even a qubit.  It is a theorem about observer independent realist theories, i.e. exactly the sort of theories that avoid talking about minds, so it can&#8217;t really say anything about them.</p>
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