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Wave/Particle Duality 
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#1
Mar1112, 01:31 PM

P: 49

If a photon can be observed as a wave or a particle, and that observation decides whether it is in fact a wave or a particle, what happens when to observers observe the same particle differently? Is it both? Is reality different for each observer?



#2
Mar1112, 01:42 PM

P: 915

thus all other observers will only see the particle face/side, no matter how they choose to observe the reality is same for all observers particle and wave states cannot be observed at the same time, even if we have more than one observer and they are using different observation methods.. to be more precise/technical  wave state can never be observed....it can only be inferred.....based on the effect of the wave on the behavior of the photon... it's not about the observer, its about the photon.....it can either be in wave state or particle state...and every observer will see the same state at any given instance of time though, i think, a partial wave state and partial particle state might be possible....for at least infinitesimally small periods of time 


#3
Mar1212, 01:42 AM

P: 49

So a wave/particle in an observer tank appears. In Sweden a researcher observes it as a wave. In America, a researcher observes it as a particle. Lease give a slution where time is negligible and where it is not.



#4
Mar1212, 02:14 AM

Sci Advisor
P: 5,369

Wave/Particle Duality
The smallest portion you can observe is a single photon. And a single photon is always observed as a particle! If you observe a wavelike phenomenon (e.g. an interference pattern) this is always created by interference of many photons (you can have a single photon interfering with itself, but it never creates an interference pattern, it always creates a single, pointlike spot or something like that).



#5
Mar1212, 02:26 AM

P: 887

I thought I had this sorted out years ago but now thinking about it, I'm not so sure.
Lets take ultrafast laser spectroscopy. A "flash" of light is a wavetrain. As the wavetrain gets shorter and shorter, eventually it will be just 1 peak; you can't have less light than 1 peak. this is a wave description of the light. now, this 1 peak can still suffer destructive and constructive interference like a wave if we had another ultrafast laser aimed the right way, very hard practically of course. this ultrashort "wavetrain" could also be diffracted by a 2 slit experiment. How would this work out? 


#6
Mar1212, 02:52 AM

Sci Advisor
P: 5,369

I am not an expert in laser spectroscopy and quantum optics but as long as you have a large number of photons in that ultrashort peak you would observe interference (for a very short time). No problemn with that theoretically.



#7
Mar1212, 04:10 AM

Sci Advisor
PF Gold
P: 2,543

Thanks Bill 


#8
Mar1212, 04:13 AM

Sci Advisor
PF Gold
P: 2,543

Thanks Bill 


#9
Mar1212, 04:41 AM

Sci Advisor
P: 5,369




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