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- Newsgroups: sci.physics,alt.sci.physics.new-theories,sci.skeptic,alt.paranormal,alt.alien.visitors,alt.conspiracy
- Path: sparky!uunet!well!sarfatti
- From: sarfatti@well.sf.ca.us (Jack Sarfatti)
- Subject: re: Hidden variables in QM (refutation of Budnik etc.)
- Message-ID: <C06xvt.BFx@well.sf.ca.us>
- Sender: news@well.sf.ca.us
- Organization: Whole Earth 'Lectronic Link
- Date: Fri, 1 Jan 1993 19:52:40 GMT
- Lines: 146
-
-
- *Sarfatti comments* on:
-
- From: paul@mtnmath.UUCP (Paul Budnik)
- Subject: Re: hidden variables
- Date: 1 Jan 93 16:08:53 GMT
- In article <1992Dec31.222704.19821@asl.dl.nec.com>, terry@asl.dl.nec.com
- writes:
- > In article <31DEC199211004292@author.gsfc.nasa.gov>
- > rkoehler@author.gsfc.nasa.gov (Bob Koehler) writes:
- >
- > > Would someone be so kind as to summarize the argument that hidden
- variable theories violate causality?
- >[...]
- > However (and simply ignoring the many person-years of "debate" in
- sci.physics on this issue), I would strongly suggest that if you look
- carefully at the way it is set up, this very odd QM "spookiness" does _not_
- violate causality any more than fully local "hidden variable" theories do.
- Causality violation means the abilty to transfer a message upon which some
- very real action can be taken.
-
- This is an interesting new definition of causality.
-
- *It is not so much a definition of cauality as it is a good definition of
- "strong causality violation". Your idea Paul I would call "weak causality
- violation".*
-
- Bell's result implys that either special relativity, quantum mechanics or
- causality as defined in classical mechanics is false.
-
- *Agreed*
-
- There is no escaping this except be redefining causality as some physicists
- have attempted to do. It is not possible to send a message instantaneously
- using this effect.
-
- *It will soon be possible to make machines that will send messages over
- both spacelike intervals and from future to present via lightlike and
- timelike intervals. These machines require a minimal generalization of
- standard quantum mechanics from "strong unitarity" which is a sufficient,
- though not necessary, condition for conservation of local probability
- current to "minimal nonunitarity" in which local probability current is
- still conserved (i.e. norms <i|i> = <i|N*N|i> = 1 are invariant) but
- orthogonal states are squashed to parallel states (i.e. <i|j> = 0 ->
- <i|N*N|j> = 1, i /=j). This does demand that N be almost an "intelligent
- operator" that induces variable phase shifts dependent on the input
- superposition. This generalized QM appears mathematically self-consistent
- and the issue is whether they exist as natural processes. There is
- circumstantial evidence that the answer is affirmative.*
-
- However, the effect does require that information be transferred
- instantaneously. We know something about possible combinations of two
- events, polarizer angles and detections, at a distant site that could not
- have been transferred in a way that preserves causality consistent with
- Lorentz invariance. In some frames of reference the information must be
- transferred from A to B and in other frames from B to A.
-
- *You can get away with this for weak causality violation but not for strong
- causality violation. In latter case, in some frames for spacelike
- communication the cause will be in the future of the effect. But in the
- timelike or lightlike "delayed choice" mode the cause will be in the future
- of the effect in all Lorentz group frames of reference - for example a
- message from the future giving the date of your death - the quantum force
- of destiny.*
-
- > The QM version just does not allow that, since no matter how you
- > arrange it the "correlations" will be recognizable _only_ after you bring
- > records back together from both sites and compare them. The latter
- process of "bringing together" the records enforces a speed-of-light delay
- that keeps the universe nicely consistent and prevents any serious (past-
- changing) info from being transferred.
-
- *This is only a temporary "unitary barrier" that we will soon smash! It is
- already smashed in precognitive experiences and in the fact that there is a
- universe delicately adjusted in its fundamental constants and boundary
- conditions that permit life to evolve.*
-
- This is true, but I believe there is a serious problem with the current QM
- model
-
- *No Paul, there is no problem. The problem is your way of understanding the
- meaning of nonlocality.*
-
- ... when you start asking what happens in the time domain in tests of
- Bell's inequality. Assume the polarizers are located some distance from the
- detectors. Assume there is a steady stream of singlet state particles that
- you are detecting. At what time does QM predict that one will see a change
- in probability of joint detections as a result of changing the angles
- between polarizers? QM does not make a clear prediction about this.
-
- *Wrong Paul. QM is perfectly clear about this as the following spacetime
- diagram shows. A pair is emiited from events 1 and 4. The first pair is
- detected at events 2 and 3. The second pair is detected at events 5 and 6.
- The standard QM formalism (without the minimal extension needed to ger
- quantum connection communication) unambiguously predicts that the nonlocal
- joint probability to detect both photons in the same local linear
- polarization state (i.e., relative to local orientations of polarizers) is
- for the first pair (i.e.,ideal conditions of efficiency etc)
-
- p(2+|3+) = {cos[@(2) - @(3)]}^2/2
-
- and for the second pair
-
- p(5+|6+) = {cos[@(5) - @(6)]}^2/2
-
- where @(i) is the actual orientation of the polarizer at the event in which
- the photon locally interacts with electrons in the polarizer. That's it,
- period! It can be derived rigorously. You have been wasting years on a non-
- problem. Try to be objective, I know its hard to moderate the ego, about
- this.*
-
-
- 5 \ / 6
- \ /
- \ /
- \ /
- \ /
- \/
- 4
- 2 \ / 3
- \ /
- \ /
- \ /
- \ /
- \/
- 1
-
-
- Considering this issue leads directly to a proof that QM is an incomplete
- theory.
-
- *False!*
-
- This is an appropriate result since it was this claim by Einstein 60 years
- ago that started this debate.
-
- *NO! Einstein showed that QM was incomplete if there was no real action at
- a distance. True, at the time he did not believe in real action at a
- distance. However, his last research assistant Ernst Straus reported that
- at the end of his life Einstein began to doubt his belief that there was no
- real action at a distance on the quantum connection. I can find the actual
- quote and reference if anyone is interested.*
-
- Paul Budnik with comments in *..* by Sarfatti
-
-
-