On 7/26/2013 8:52 AM, John Clark wrote:
On Thu, Jul 25, 2013 at 6:21 PM, meekerdb <meeke...@verizon.net
> I think this misunderstands Jason's thought experiment. I think he's
source is polarized at 0deg, the same as A, not a random source as you
The photon has no polarization at all unless a filter is involved somewhere. My filter
can be orientated at any angle, in this case it just happens to be 0 degrees. When it
hits the filter only 2 things can happen, the photon goes through the filter or it does
not. The probability of the undifferentiated photon going through the filter or being
stopped by it is 50 50 and I have no way of changing that probability. If the photon
goes through my filter set at 0 degrees then the photon was always polarized at exactly
0 degrees and so was its entangled brother photon a billion light years away even if the
two were created a billion years ago. If the photon does NOT get through my filter set
at 0 degrees then the photon was always polarized at exactly 90 degrees and so was its
entangled brother photon a billion light years away even if the two were created a
billion years ago.
Remember that I could have picked any angle to set my filter at, I picked angle X for no
particular reason and did so only 30 seconds ago, but my choice today means that my
photon and its entangled brother a billion light years away have always been polarized
at X degrees or at X + 90 degrees. So I have made the number X special to both photons
regardless of if my photon gets through my filter or not, even though both photons were
created a billion years before I was born. You can't use this for faster than light
communication but I still find it very weird.
> He's proposing that inserting B will cause A to transmit some photons
go thru C. Removing B will result in no photons passing thru C. So
replacing B can send dots and dashes to someone just beyond C.
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.
Yes, I think that's the answer. B only affects the transmission at C when the photon goes
through B, and having an entangled partner photon go through B only breaks the entanglement.
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