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| Tags: microquantum, nonlocality, orthodox, physics, signal |
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Memorandum for the Record
from Jack Sarfatti Thanks to Gary Bekkum for alerting me to this 1999 paper. The author of this paper is competent and cites key past papers arguing against signal nonlocality in orthodox micro-quantum physics based essentially on the fact that the first reduced quantum density matrices of each particle in the EPR entangled pair are insensitive to the distant choice of type of measurement (basis) as described by Henry Stapp and several others now almost 30 years ago. I have not had time to understand every detail of Srikanth's paper based on new technology that was not available at the time in the late 1970's when I came up with a roughly similar idea of using relative phase interference at the receiver that was published in the early editions of Gary Zukav's "The Dancing Wu Li Masters". Under pressure from some physicists, Gary caved in and removed that entire section in later editions that are now of great historical interest showing I was generally ahead of the curve back then. Of course Srikanth's idea is much better than what I had originally more vaguely suggested, which would not have worked, but which, nevertheless, pointed in an interesting direction of inquiry that blossomed in 1999. If Srikanth's 1999 paper survives critical scrutiny it is very important because it says that signal nonlocality is not essential even in linear nonlocal micro-quantum theory as distinct from "more is different" (PW Anderson) nonlinear local macro-quantum theory. The macro-quantum theory is to micro-quantum theory as general relativity is to special relativity with "nonlinearity" from Bose-Einstein condensation analogous to "curvature" in general relativity. This impacts Antony Valentini's work that signal locality is a consequence of sub-quantal heat death i.e. an "equilibrium" of the hidden variables giving the Born probability distribution P(x) ~ |x|psi|^2 for the pure micro-quantum state |psi. My interferometer EPR gedankenexperiment was described on pages 311 to 314 of the original 1979 edition of "The Dancing Wu Li Masters" published by William Morrow. Note the remarks below were written several years before Aspect's actual Paris experiment was completed in 1982. I also did not have PW Anderson's 1967 "More is different" idea in mind at that time in the late 1970's even though I wrote a 1966 paper on Goldstone broken symmetry in solid state physics (Jahn-Teller) with Marshall Stoneham at UKAEA Harwell (published in Proceedings of the Physical Society of London 1967). I had not yet connected those dots and would not do so until 2002 as in http://qedcorp.com/APS/Ukraine.doc It seems that the "collapse" of the micro-quantum wave in "measurement" always needs an "irreversible amplification" from micro to macro levels, which according to PW Anderson has something akin to a "More is different" BEC, preserving the micro-information in the amplification needed for a good measurement, i.e. a definite decohered pointer state. That is, the initial micro-quantum information must be reliably preserved in the amplification process leading to a macro signal that is the final "measurement". Each "quantum" in the cascade amplification must keep that original micro-information intact which is analogous to a BEC where each quantum is in the same micro-quantum state. "According to Sarfatti, however, in terms of information theory, the Aspect experiment, at best, will demonstrate a pure noise superluminal channel. This is because the Aspect experiment, as it is designed, uses only the particle mode of complementarity in its detection process. Therefore, Sarfatti proposes that we replace Aspect's photomultipliers (which are particle detectors) with double-slit systems that have 'Heisenberg microscopes' at each slit. A double slit system is a wave detector. A Heisenberg microscope is a particle detector ... The use of a double slit system with Heisenberg microscopes ... gives us the option of using either a wave mode of detection or a particle mode of detection .... Sarfatti theorizes ... that the interference pattern that we see at one end of such a dual double slit system is inseparably linked, photon pair by photon pair, with the interference pattern that we see at the other end in a way that is beyond spacetime. Therefore, a modulation of the interference pattern at one end of the system will cause a similar modulation at the other end of the system even though no energy-momentum transporting signal is connecting the two processes. This is what Sarfatti calls a 'nonlocal phase lock over space-like intervals' ..." pp. 312 - 313 1979 edition of Wu Li Masters. Now compare the above from 1978 to Srikanth 1999 "The signal sender measures either position or momentum of particles" That is "Alice" the "sender" measures either the "particle" or "wave" aspect. Srikanth does not use a double slit at the sender but he has a functional equivalent to it. "Two spatially seperated observers, Alice and Bob analyze the light. Alice is equipped with a device, labelled K, to measure momentum or position of the photons in x and y direction. Bob is equipped with a Young's double-slit interferometer" Equation (5) shows the Young double slit interference pattern at the receiver that Bob sees locally provided that Alice makes a "wave" (transverse momentum) measurement at the sender. On the other hand if Alice at the sender chooses to measure both transverse position y and longitudinal momentum px, then eq. (9) for a single slit diffraction pattern is observed by Bob at the receiver. Srikanth's gedankenexperiment is, of course, far superior and more quantitative than what I suggested 20 years before him. It also uses technology not available in the 1970's. Should his scheme prove correct, I cannot say at this point, then it is a great achievement and it will again show how premature rejection of even half-baked ideas on the "fringe" can often slow the progress of fundamental physics. [BTW note in passing that I mention "torsion" in gravity theory in footnote on p. 199 of that 1979 edition.] On Saturday, August 16, 2003, at 10:09 AM, Jack Sarfatti wrote: Thanks - looks interesting. I will study it. On Saturday, August 16, 2003, at 09:31 AM, Gary Stephen Bekkum wrote: Hi Jack, I saw the reference to the Oak Ridge paper, and noticed that they referenced R Srikanth, a 'target' of conceptual RV'ing. See this paper: http://www.arxiv.org/abs/quant-ph/9904075 Noncausal Superluminal Nonlocal Signalling Authors: R. Srikanth Comments: Includes a refinement of the thought-experiment presented earlier, 4 figures (new); Two sections added: to explain how no-signalling arguments are circumvented; and to propose a plan for a possible practical realization of the thought-experiment Report-no: IIAp-99/7/1 "We propose a thought experiment for classical superluminal signal transmission based on the quantum nonlocal influence of photons on their momentum entangled EPR twins. The signal sender measures either position or momentum of particles in a pure ensemble of the entangled pairs, leaving their twins as localized particles or plane waves. The signal receiver distinguishes these outcomes interferometrically using a double slit interferometer modified by a system of optical filters. Since the collapse of the wavefunction is postulated to be instantaneous, this signal can be transmitted superluminally. We show that the method circumvents the no-signalling theorem because the receiver is able to modify the disentangled wavefunction before his measurement. We propose a plan for the possible practical realization of a superluminal quantum telegraph based on the thought experiment." _ |
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