tag:blogger.com,1999:blog-29286191.post282881039885272460..comments2019-11-11T07:40:01.272-08:00Comments on Too Clever By Half: QM and the problem of Beingtttitohttp://www.blogger.com/profile/00184498463827734499noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-29286191.post-69647193373235109282008-10-01T06:03:00.000-07:002008-10-01T06:03:00.000-07:00I forgot that The Leggett paper is not freely avai...I forgot that The Leggett paper is not freely available for download. However here are two links that should give an idea of the progress that has been made over the last few years.<BR/><BR/>http://physicsworld.com/cws/article/print/525<BR/>http://physicsworld.com/cws/article/print/21590<BR/><BR/>Since I regard entanglement as an observer-dependent property of the measurement process, I disagree with the conceptual framework implicit in Zeilinger and Arndt's approach ( eg. when they state that 'The environmental state gets "entangled" with the quantum object, which means that information about the whereabouts of the object is rapidly disseminated into the surroundings'). The experiments described are relevant far beyond my objections, but I believe that the search for macroscopic superpositions is being hampered by erroneous theoretical views. In a nutshell, the whole "which path" pother arises from neglect of the unitarity breakdown that corresponds to measurement/perception.tttitohttps://www.blogger.com/profile/00184498463827734499noreply@blogger.comtag:blogger.com,1999:blog-29286191.post-59898331840724146662008-09-17T03:14:00.000-07:002008-09-17T03:14:00.000-07:00Thanks for your interest in my work. Superposition...Thanks for your interest in my work. Superpositions (e.g. of electrical currents) that are arguably macroscopic have indeed been experimentally detected. Some of the relevant experiments are described and discussed by Anthony Leggett in the survey paper which I quote and reference in my post "Deconstructing decoherence" below. Detection of actual superposed cats and people at room temperature has not been experimentally realised yet. I am confident that it's just a matter of time.tttitohttps://www.blogger.com/profile/00184498463827734499noreply@blogger.comtag:blogger.com,1999:blog-29286191.post-26798041786672483472008-09-15T04:46:00.000-07:002008-09-15T04:46:00.000-07:00About your article "Interference of macroscopic su...About your article "Interference of macroscopic superpositions": has that experiment, or a similar one, been done?<BR/>I cannot believe to macroscopic superposition, but probably I would neither to microscopic superposition, had I been born in nineteenth century!<BR/><BR/>RogerAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-29286191.post-289023027879734332008-09-14T09:33:00.000-07:002008-09-14T09:33:00.000-07:00Thanks for your post. I have already commented els...Thanks for your post. I have already commented elsewhere (see <A HREF="http://listserv.arizona.edu/cgi-bin/wa?A2=ind0005&L=QUANTUM-MIND&P=R71&I=-3" REL="nofollow">1</A>, <A HREF="http://groups.google.it/group/sci.physics.research/msg/25a9e8b3a91dff3d" REL="nofollow">2</A>) on Penrose's theory of gravity-induced collapse, which is <BR/>actually originally due to Diosi, as Penrose himsef duly acknowledges. <BR/>Superpositions that are arguably macroscopic have already been detected and I think it's only <BR/>a matter of time until superposed observers are detected. In general, since i regard quantum mechanics as an epistemic theory, I am skeptical about Penrose's ontologic approach. In my opinion <BR/>what is needed and what will emerge is indeed a relational quantum "theory of experience", even if turns out to be as troublesome as Penrose fears. Finally I vaguely remember Zeilinger suggesting that a table-top version of Penrose's experiment should be doable in the near future, but a quick websearch indicates that nothing concrete has come out of it yet.tttitohttps://www.blogger.com/profile/00184498463827734499noreply@blogger.comtag:blogger.com,1999:blog-29286191.post-68485660713638420032008-09-13T05:41:00.000-07:002008-09-13T05:41:00.000-07:00What about Penrose's theory of QM "macroscopic" an...What about Penrose's theory of QM "macroscopic" and "microscopic" worlds? If confirmed by evidence, it would provide both an elegant liaison between quanta and gravitation and would define exactly what is subject to QM and what isn't.<BR/>By the way, has the crucial experiment devised by Penrose been done?<BR/><BR/>RogerAnonymousnoreply@blogger.com