| Topic: |
Science > Physics |
| User: |
"Ross" |
| Date: |
17 Dec 2004 01:30:16 PM |
| Object: |
Questions about Double Slit Experiment |
When a photon is measured passing through a slit, is there interaction
between the photon and the measuring equipment? For instance, if it
were a baseball and I was watching the slit, I could see the baseball
pass through the slit without any interaction at all. In the case of a
photon, does verifying its path at the slit require deflecting the
photon and hence interacting with it? If so, it would seem this is more
than just knowledge of the event (except in the situation that there is
one photon emitted that passes through the slit I am not measuring).
AlIf I am watching the wall where the photons end up, I know by the
interference pattern that they have taken both paths.
Since measuring at a slit means that a photon has passed through the
slit I amd measuring or the alternative slit, does this mean, as the
photons are shot at the slit one photon at a time with a delay in
between, that I will detect some photons passing through the slit I am
measuring and that there are others that are not detected except at the
pattern formed on the wall? What determines the distribution through
one slit or the other?
What happens when I am measuring at both slits when photons are being
sent one at a time?
When there are 2 slits and I am measuring at one of the slits, is there
any way to increase or decrease the likelihood that the photon is going
to pass through one slit or the other?
Can the slits be any distance apart and still require the photons to
pass through both slits?
Can the slits be holes (round) rather than slits?
Ross Skiles
Does the angle between the origin of the photons and the slits make any
difference where the distance to one slit is longer than the distance
to the other?
.
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| User: "George Cox" |
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| Title: Re: Questions about Double Slit Experiment |
17 Dec 2004 02:43:45 PM |
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Ross wrote:
When a photon is measured passing through a slit, is there interaction
between the photon and the measuring equipment? For instance, if it
were a baseball and I was watching the slit, I could see the baseball
pass through the slit without any interaction at all.
No you couldn't: photons bounced off the ball and entered your eyes.
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| User: "Uncle Al" |
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| Title: Re: Questions about Double Slit Experiment |
17 Dec 2004 02:48:29 PM |
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Ross wrote:
When a photon is measured passing through a slit, is there interaction
between the photon and the measuring equipment? For instance, if it
were a baseball and I was watching the slit, I could see the baseball
pass through the slit without any interaction at all. In the case of a
photon, does verifying its path at the slit require deflecting the
photon and hence interacting with it? If so, it would seem this is more
than just knowledge of the event (except in the situation that there is
one photon emitted that passes through the slit I am not measuring).
AlIf I am watching the wall where the photons end up, I know by the
interference pattern that they have taken both paths.
[snip]
Quantum eraser and quantum double eraser experiments. Google them.
This sort of thing has been vigorously debated in the literature and
tested in the lab for a long time. If it is worth knowing it is worth
finding it in a technical library. faa.gov? I've been through an
airport recently.
http://www.mazepath.com/uncleal/ss1.jpg
You can go ***** yourself.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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