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From : h4ck3rm1k3
Added: Dec 7, 2008
This also shows that in between the measurements given by proper (that is, non-unitary) quantum operations, one can interpolate arbitrary unitary evolution. Quantum probabilities explained by continuous branching Dr. David Deutsch along with Oxford colleagues have demonstrated mathematically that the bush-like branching structure created by the universe splitting into parallel versions of itself can explain the probabilistic nature of quantum outcomes. In the New Scientist article on the discovery, Andy Albrecht, a physicist at the University of California at Davis, is quoted as saying "This work will go down as one of the most important developments in the history of science." Deutsch and his Oxford colleagues are thus seen to apparently bolster March - May '07 internet postings of Dr. David Anacker (to physics cognoscenti including Lisa Randall, Lee Smolin, David Deutsch, G. T'Hooft, S. Glashow, S. Weinberg, M. Kaku, L. Susskind, et.al.) via internet archive (http://www.hamnamtataqm.bravehost.com /testbk2bkp.htm) earlier establishing agreement between predictive statistics of [12] the Everett and Copenhagen interpretations. Acceptance among physicists There is a wide range of claims that are considered "many worlds" interpretations. [27] that Everett himself was It is often claimed by those who do not believe in MWI not entirely clear as to what he believed; however MWI adherents believe they fully understand Everett's meaning as implying the literal existence of the other worlds. Additionally some MWI adherents point to Everett's reported belief in quantum immortality, which they also take to require belief in the reality of all the many worlds represented by the components of the uncollapsed universal [28] wavefunction. "Many worlds"-like interpretations are now considered fairly mainstream within the quantum physics community. For example, a poll of 72 leading physicists conducted by the American researcher David Raub in 1995 and published in the French periodical Sciences et Avenir in January 1998 recorded that nearly 60% thought many worlds interpretation was "true". Max Tegmark also reports the [29] According to result of a poll taken at a 1997 quantum mechanics workshop. Tegmark, "The many worlds interpretation (MWI) scored second, comfortably ahead of the consistent histories and Bohm interpretations." Other such polls have [30] report been taken at other conferences: see for instance Michael Nielsen's blog on one such poll. Nielsen remarks that it appeared most of the conference attendees "thought the poll was a waste of time". MWI sceptics (for instance Asher Peres) argue that polls regarding the acceptance of a particular interpretation within the scientific community, such as those mentioned above, cannot be used as evidence supporting a specific interpretation's validity. However, others note that science is a group activity (for instance, peer review) and that polls are a systematic way of revealing the thinking of the scientific community. A 2005 minor poll on the Interpretation of Quantum Mechanics workshop at the Institute for Quantum Computing University of Waterloo produced contrary results, [31] with the MWI as the least favored. One of MWI's strongest advocates is David Deutsch. According to Deutsch the single photon interference pattern observed in the double slit experiment, can be explained by interference of photons in multiple universes. Viewed in this way, the single photon interference experiment is indistinguishable from the multiple photon interference experiment. In a more practical vein, in one of the earliest [33] he suggested that parallelism that results from papers on quantum computing, the validity of MWI could lead to "a method by which certain probabilistic tasks can be performed faster by a universal quantum computer than by any classical restriction of it". Deutsch has also proposed that when reversible computers become conscious that MWI will be testable (at least against "naive" [34] Copenhagenism) via the reversible observation of spin. Asher Peres was an outspoken critic of MWI, for example in a section in his 1993 textbook with the title Everett's interpretation and other bizarre theories. In fact, Peres questioned whether MWI is really an "interpretation" or even if interpretations of quantum mechanics are needed at all. Indeed, the many-worlds [32] interpretation can be regarded as a purely formal transformation, which adds nothing to the instrumentalist ( i.e. statistical) rules of the quantum mechanics. Perhaps more significantly, Peres seems to suggest that positing the existence of an infinite number of non-communicating parallel universes is highly suspect as it violates those interpretations of Occam's Razor that seek to minimize the
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