From pscrutton@yahoo.com Thu Nov 14 21:29:48 2002 Return-Path: Received: from web21409.mail.yahoo.com (web21409.mail.yahoo.com [216.136.232.79]) by helios.physics.utoronto.ca (8.9.3/8.9.3) with SMTP id VAA6173876 for ; Thu, 14 Nov 2002 21:29:47 -0500 (EST) Message-ID: <20021115022923.25983.qmail@web21409.mail.yahoo.com> Received: from [24.156.126.78] by web21409.mail.yahoo.com via HTTP; Thu, 14 Nov 2002 18:29:23 PST Date: Thu, 14 Nov 2002 18:29:23 -0800 (PST) From: philip scrutton Subject: Re: PHY485 workshop To: Aephraim Steinberg In-Reply-To: <200211071951.gA7Jpf14009851@courses.ece.toronto.edu> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="0-932745955-1037327363=:25341" Status: R --0-932745955-1037327363=:25341 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello Prof. Steinberg, Here's my abstract.... Philip Scrutton __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - Let the expert host your site http://webhosting.yahoo.com --0-932745955-1037327363=:25341 Content-Type: text/plain; name="PHY485ABSTscrutton.txt" Content-Description: PHY485ABSTscrutton.txt Content-Disposition: inline; filename="PHY485ABSTscrutton.txt" Experimental Test's of Bell's Inequality Philip Scrutton Quantum mechanics predicts that two particles described by a single coupled wavefunction, but separated in space, may interact non-locally. If a measurement of one particle is taken, then the physical state of the other will be effected. Einstein, Podolsky, and Rosen (EPR) pointed out this implication of non-locality and suggested that hidden variables exist which could locally account for this and therefore that QM was an incomplete theory. Later, Bell, based on the assumption of extra variables being present, derived inequalities that must hold for the existance of these variables. More recently, optical experiments designed to test the Bell's inequalities have been undertaken. Interestingly these experiments support quantum non-locality, or action-at-a-distance. I will introduce the subject with a non-rigourous discussion, then explain the schemes for experiments. I will discuss how a two particle singlet state is produced, and how non-locality is tested, including phase-matching and detection, etc.. I will point to the 'loopholes' in these experimental tests and how recent experiments deal with them. Generally I will progress through things chronologically, but discuss only major developments, and those most useful for illustrating the optical techniques required. I will end with the current situation in the field, and a mention of application of non-locality in quantum cryptography. --0-932745955-1037327363=:25341--