On 07-07-2021 01:17, Bruce Kellett wrote:
On Tue, Jul 6, 2021 at 11:41 PM smitra <[email protected]> wrote:
On 06-07-2021 14:10, Bruce Kellett wrote:
It is a shame that your fancy analysis is contradicted by the
actual
experimental results. I leave it as an exercise for you to
determine
where your mistake is. But I suggest that you actually reads the
paper
quant-ph/0412003.
The analysis is 100% rigorous, based on standard QM. The results of
the
paper quant-ph/0412003 are irrelevant as they don't measure the
joint
interference pattern.
It is only your confused notion that even considers such a thing to be
relevant. Hornberger et al. give a complete and detailed quantum
analysis of their experiment and show that their results are in
complete accordance with quantum theory. The thing is that you have to
take their experiment results, particularly as shown in Fig 8 of the
paper, seriously. They show that the interference fringes are
gradually washed out as the temperature of the balls increases. I
quote their abstract:
"We study C_70 fullerene matter waves in a Talbot-Lau interferometer
as a function of their temperature. While the ideal fringe visibility
is observed at moderate molecular temperatures, we find a gradual
degradation of the interference contrast if the molecules are heated
before entering the interferometer. A method is developed to assess
the distribution of the micro-canonical temperature of the molecules
in free flight. This way the heating-dependent reduction of the
interference contrast can be compared with the predictions of quantum
theory. We find that the observed loss of coherence agrees
quantitatively with the expected decoherence rate due to the thermal
radiation emitted by the hot molecules."
None of this contradicts what I wrote.
In that case the interference pattern of the balls
will vanish due to the photon states being orthogonal, as I've shown
above.
The argument against the existence of parallel worlds by invoking
decoherence that makes superposition hard to detect for complex
systems is thus analogous to the defense of creationists when
they invoke a
God of ever smaller gaps of things that have not yet been fully
explained.
My dear, you really have lost the plot, haven't you Saibal?
I'm sticking to QM, your position depends on some unproven effect
that
would make pure states evolve into mixed states.
Your idea of QM is sadly flawed. The real professional quantum
analysis given in the quoted paper shows how the observed effects are
completely consistent with quantum mechanics. The emission of thermal
radiation by the heated balls leads to a clear and evident loss of
coherence. Your pseudo-analysis has nothing to do with either quantum
mechanics or the actual set-up of this buckyball experiment.
As I said, what I wrote is 100% consistent with their results. The fact
that you can't see this implies that you have forgotten basic QM and are
unqualified to continue this discussion. I remember from a while back on
this list that you claimed that in two slit experiment, if the
wavefunctions of the particle moving through the left slit is orthogonal
to that of the right slit, then there would be no interference. This is
obviously wrong, and there was a long discussion where you kept on
repeating your flawed point.
Saibal
Bruce
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