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

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