closing the detection loop hole in testing bells inequalities [Archive]

Hilgenberg

May12-04, 01:41 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Hello,\n\ndoes anybody knows the current state to closing the detection loop hole in\ntesting bells inequalities?\n\nBernd\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Hello,

does anybody knows the current state to closing the detection loop hole in
testing bells inequalities?

Bernd

Charles Francis

May13-04, 05:25 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\n\nIn message <51cba054.0405080706.4a803c27@posting.google.com >, Hilgenberg\n<glueck772000@yahoo.de> writes\n>Hello,\n>\n>does anybody knows the current state to closing the detection loop hole in\n>testing bells inequalities?\n>\n\nQuantum mechanics gives only probabilities for transitions between\nmeasured states. E.g. the wave function is the inner product between an\ninitial known state |f> and a final measured state |x>, f(x)=<x|f>. You\nonly worry about a detection loophole if you think that this has meaning\noutside of measurement, which is something of an oxymoron in the\northodox interpretation.\n\n--\nCharles Francis\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>In message <51cba054.0405080706.4a803c27@posting.google.com>, Hilgenberg
<glueck772000@yahoo.de> writes
>Hello,
>
>does anybody knows the current state to closing the detection loop hole in
>testing bells inequalities?
>

Quantum mechanics gives only probabilities for transitions between
measured states. E.g. the wave function is the inner product between an
initial known state |f> and a final measured state |x>, f(x)=<x|f>. You
only worry about a detection loophole if you think that this has meaning
outside of measurement, which is something of an oxymoron in the
orthodox interpretation.

--
Charles Francis

Igor Khavkine

May14-04, 04:10 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>On Wed, 12 May 2004 18:41:23 +0000, Hilgenberg wrote:\n\n> Hello,\n>\n> does anybody knows the current state to closing the detection loop hole in\n> testing bells inequalities?\n\nI\'m not sure if experiments have definitely closed this loophole yet,\nbut the next generation of these experiments should. I was recently\ntreated to a very nice colloquium given by Alain Aspect on the subject\nof experimental tests of Bell\'s inequality. His notes for the talk\nare poisted on the arxiv quant-ph/0402001. The detection loophole is\nexplicitly mentioned on page 29 and in reference 11.\n\nHope this helps.\n\nIgor\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>On Wed, 12 May 2004 18:41:23 +0000, Hilgenberg wrote:

> Hello,
>
> does anybody knows the current state to closing the detection loop hole in
> testing bells inequalities?

I'm not sure if experiments have definitely closed this loophole yet,
but the next generation of these experiments should. I was recently
treated to a very nice colloquium given by Alain Aspect on the subject
of experimental tests of Bell's inequality. His notes for the talk
are poisted on the arxiv http://www.arxiv.org/abs/quant-ph/0402001. The detection loophole is
explicitly mentioned on page 29 and in reference 11.

Hope this helps.

Igor

MM

May14-04, 04:13 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>glueck772000@yahoo.de (Hilgenberg) wrote:\n\n> does anybody knows the current state to closing the detection\n> loop hole in testing bells inequalities?\n\nAlain Aspect\'s recent paper quant-ph/0402001 might be of interest.\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>glueck772000@yahoo.de (Hilgenberg) wrote:

> does anybody knows the current state to closing the detection
> loop hole in testing bells inequalities?

Alain Aspect's recent paper http://www.arxiv.org/abs/quant-ph/0402001 might be of interest.

carlip@no-physics-spam.ucdavis.edu

May17-04, 07:35 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Hilgenberg <glueck772000@yahoo.de> wrote:\n\n> does anybody knows the current state to closing the detection loop hole in\n> testing bells inequalities?\n\nThere\'s a paper by Rowe et al., Nature 409 (2001) 791, that\nclaims to have closed the detection loophole. I\'m not enough\nof an expert in this field to comment in detail. (I know that\nthe experiment did not simultaneously close the detection and\nlocality loopholes.)\n\nSteve Carlip\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Hilgenberg <glueck772000@yahoo.de> wrote:

> does anybody knows the current state to closing the detection loop hole in
> testing bells inequalities?

There's a paper by Rowe et al., Nature 409 (2001) 791, that
claims to have closed the detection loophole. I'm not enough
of an expert in this field to comment in detail. (I know that
the experiment did not simultaneously close the detection and
locality loopholes.)

Steve Carlip