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Natural Science Forum / Physics / Particle Physics / July 2005



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How do you define  'a single photon'  ??

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Y.Porat - 26 Jul 2005 06:40 GMT
So
how do you define 'a single photon' ??

TIA
Y.Porat

---------------------
FrediFizzx - 26 Jul 2005 08:06 GMT
| So
| how do you define 'a single photon' ??

With extreme difficulty.  Read Milonni's "The Quantum Vacuum:  An Intro.
to QED".

FrediFizzx

http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.pdf
or postscript
http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.ps
Y.Porat - 26 Jul 2005 10:05 GMT
Thanks Fred
yet

1
i don't have it

2
what is Vacum got to do with it ???

3 can you give some simple bottom lines??

TIA
Y.Porat
----------------------
Ian Parker - 26 Jul 2005 11:20 GMT
I think perhaps we may be looking at this in the wrong way. If we state
the laws of quantum mechanics mathematically, we find that 2 slits
produce a sinusoidal probability density, taking a very simple example.
A single photon, or electron for that matter, is simply this
probability density. Phenomenologically this is the end of the story.

If we then show that aggregates of particles exhibit  Newtonian (or
common sense) physics this provides a satisfactory explanation. Our
brains are tuned for aggregates (which are Newtonian). This is why we
find it difficult to get our minds round single photons.
Y.Porat - 26 Jul 2005 15:08 GMT
and if i ask you to device a machine
that will produce *single photon*

preferred only single photons !!

what will you do for it ???
(and how can you make sure that it is only single photons??)

TIA
Y.Porat
-----------------------
Autymn D. C. - 26 Jul 2005 17:16 GMT
> and if i ask you to device a machine
devise
> that will produce *single photon*
>
> preferred only single photons !!
>
> what will you do for it ???
> (and how can you make sure that it is only single photons??)

I dunnode.
Uncle Al - 26 Jul 2005 17:45 GMT
> So
> how do you define 'a single photon' ??

The stuff that comes out of a single photon emitter and is logged in
by a single photon detector.  Both are commercial hardware.

Signature

Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf

Y.Porat - 26 Jul 2005 18:21 GMT
thank you Al
for the first time in my life i lived to get from you
an apposite answer without an *automatic*  personal abuse!!

now
how do we define a single photon theoretically??
what is the smallest possible one ??

or the one with the smallest energy??
how it is defined theoretically?
??(if there is at all 'the smallest')

2
how do we know it is a single photon and not 2 or 3 of them??

3
may be both  the   'emitter and the detector    define 10 of them as
one ??
(10 is just an example )

iow
may be the whole issue deserves some new thinking  and examination ??

now i will tell you  my ulterior motive to ask those questions:
(among other reasons)

if it will be found that it is  not actually just 'one photon' but some
of them
than it might   shed new light on the 'double slit  enigma??)

PS do you notice some improvement in my spelling??

it is not because i became a better  English  writer...
it is due to one of the members here that directed me to a good useful
spell checker!
sorry i forgot the Gentleman's name ...
and if still spelling mistake - it is the   speller fault .......

TIA
Y.Porat
-------------------------------
Jan Panteltje - 26 Jul 2005 18:38 GMT
>> So
>> how do you define 'a single photon' ??
>
>The stuff that comes out of a single photon emitter and is logged in
>by a single photon detector.  Both are commercial hardware.
So is snakeoil: Single photon detector hehe.

And how does the 1MHz photon detector work then oh Al knowing?
Y.Porat - 30 Jul 2005 14:05 GMT
No answer ???

TIA
Y.Porat
------------------------
tgdenning@earthlink.net - 30 Jul 2005 14:56 GMT
If I detect  EM effect of frequency f with energy E=hf.
Then I have detected a photon.

-tg
Y.Porat - 31 Jul 2005 05:57 GMT
Thanks    (you can guess i knew it)

now the next question
according to that definition there are
infinite versions of photons

do you want to say that if i use in the double slit experiment      a
photon with F=1000
or  f= 1000000
it will give the same results ??

in that case how do you make sure it is
really f=1000 and not f= 10010 ?

yet the question still is :

what is a 'single photon'??
the one that is 'used'
in the double slit experiment??

2 what is the smallest one
IE that has the  smallest energy??

TIA
Y.Porat
---------------------------
 
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