On Fri, Jul 26, 2013 at 3:57 PM, John Clark <johnkcl...@gmail.com> wrote:

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> On Fri, Jul 26, 2013Jason Resch <jasonre...@gmail.com> wrote: > > > If a photon passes a filter orientated at 0 degrees, then it encounters >> a filter at 90 degrees it will be blocked. >> > > How do you know the photon is oriented at 0 degrees? > Because it passed a filter orientated at 0 degrees. > If the photon has never been measured, if neither it nor its entangled > twin has ever passed through a filter of any sort before and now for the > first time it encounters a filter set at 90 degrees, or set at ANY other > angle, the probability it will be blocked by the filter is 50 50. > > >> > But, if you insert a filter in the middle orientated at 45 degrees >> then there is a 50% chance it will continue through that filter after >> passing the 0 degree filter, and also a 50% chance that that photon will >> also pass the filter at 90 degrees. Therefore there is a 25% chance a >> photon that passes the filter at 0 degrees passes the next 2 filters. >> > > Yes, and one chance in 8 that a previously unmeasured undifferentiated > photon will make it through all 3 filters. > Yes, like I said. > > >> If my differentiated photon with a known polarization encounters a >>> filter that its brother photon has not then the delicate quantum >>> entanglement between the two is destroyed and there are just 2 unrelated >>> photons a billion light years away >> >> >> >I don't think that is correct. >> > > It is correct, measurement can be very detrimental to quantum > entanglement, that's why making a quantum computer is so difficult. > > > If a photon passes a 0 degree filter, >> > > Then it has always been orientated at 0 degrees and so has its entangled > twin, if you then put a filter set at 45 degrees in the photon's path there > is a 50 50 chance it will get through, but get through or not the > entanglement will have been destroyed unless somebody a billion light years > away also put a filter set at 45 degrees in the distant photon's path. > > > the twin photon a billion light years away will always be stopped by a >> 90 degree filter. >> > > Yes, > So why is it the entanglement is destroyed by the presence of the 45 degree filter, but not the 0 degree filter? Jason > but there is no way to use that fact to send a message, because I have no > way of forcing a unmeasured photon make it through my filter or be blocked > by it, the chances are always 50 50; so I have no way to send a dot instead > of a dash or a dash instead of a dot, so the only message I can send is > random gibberish. > > John K Clark > > > > > -- > 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 http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- 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 http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.