> On 27 Apr 2018, at 05:02, Bruce Kellett <bhkell...@optusnet.com.au> wrote: > > From: Brent Meeker < <mailto:meeke...@verizon.net>meeke...@verizon.net > <mailto:meeke...@verizon.net>> >> On 4/26/2018 7:16 PM, Bruce Kellett wrote: >>> On 4/26/2018 5:55 PM, Bruce Kellett wrote: >>>>> From: Brent Meeker < <mailto:meeke...@verizon.net>meeke...@verizon.net >>>>> <mailto:meeke...@verizon.net>> >>>>>> >>>>>> On 4/26/2018 3:41 PM, Bruce Kellett wrote: >>>>>> >>>>> My point was that if there is a record that a measurement was made, >>>>> something irreversible has been extracted from the >>>>> experiment. If the QC is "conscious", then it has to interact with >>>>> something to make this irreversible record, so its quantum state is >>>>> irreversibly changed. But you are probably right: if there is no >>>>> decoherence, then there is no consciousness, since consciousness involves >>>>> irreversible memory. >>>> >>>> There are experiments already performed in which the welcher weg is >>>> available but is erased, even spacelike relative to detection >>> >>> I know. But no information was extracted from the welcher weg photons >>> before they were erased. I.e., no consciousness "recorded" which way and >>> then forgot the result. I think the act of recording the result, by a >>> consciousness or anything else, is inherently irreversible. If no record is >>> made, then erasure is perfectly possible. Just knowing that there were >>> welcher weg photons that have been erased is not quite the same thing. >> >> But that's my question: Why isn't it the same? And even if it's not how >> would be know? The "conscious" quantum computer assures us that it not only >> detected that there was a welcher weg photon but that it's weg was known to >> the "consciousness" of the quantum computer, before it was erased. But why >> would we believe it? We already have these experiments in which we know the >> weg was available and could have been recorded, but was erased. So what is >> the "consciousness" that adds a secret-sauce to the experiment? > > Good question. I doubt that you can fool quantum mechanics by calling it > "consciousness". I think in this case the interaction with the welcher weg > photon would amount to sufficient decoherence -- basically information was > extracted that was not restored. Also, of course, if the QC "forgets" what it > did, how can it report on the fact that it did anything. How can we believe > that it actually knew which slit at some point?
Because in Deutsch experiment, not everything has been erased, notably the memory that he has known the result. He would say something like: I remember doing the measurement and writing it in the enveloppe. Now the envelop has been erased, and I can’t remember its content, but I definitely remember having known the content. Bruno > > Bruce > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to everything-list+unsubscr...@googlegroups.com > <mailto:everything-list+unsubscr...@googlegroups.com>. > To post to this group, send email to everything-list@googlegroups.com > <mailto:everything-list@googlegroups.com>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
