On 12/4/2012 12:32 PM, Craig Weinberg wrote:
On Tuesday, December 4, 2012 2:52:25 PM UTC-5, Brent wrote:
Kinda depends on what you mean by 'available'. If the entangled photon is
allowed
to hit a wall and be absorbed, it is only 'available' to a kind of
Maxwellian demon
who can discern the thermal atomic motions and trace them back to get
which-way
infomation - but the interference pattern is destroyed anyway. If the
entangled
photon is simply allowed to fly out the window and off to infinity it is
'available'
many years later to an inhabitant of some extra-solar planet - and the
interference
pattern is destroyed in our present.
What if the inhabitant of the extra-solar planet catches the photon in a lens just like
the quantum eraser?
The interference would be destroyed. Note that the way the experiment works (and
necessarily so) is that the photons detected at the interference plane have to be
post-selected to pair up with those either erased or not on the other leg. So since an
extra-solar observer could only catch a small fraction of the photons, the interference
would erased in the corresponding small fraction of those hitting the interference plane.
What if the inhabitant naturally has eyes which function as quantum erasers?
Those wouldn't be eyes. The eraser focuses the photons on the same spot whichever slit
they went through so the 'eyes' that would erase the information are 'eyes' that can't
resolve the slits.
What if the inhabitant has one eye which is a quantum eraser and one which
isn't?
Depends on which one detects the photon.
What if the inhabitant has a cat in a box with a cyanide capsule triggered by...
What if you read the papers yourself.
Brent
--
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To post to this group, send email to everything-list@googlegroups.com.
To unsubscribe from this group, send email to
everything-list+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/everything-list?hl=en.
