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Stephen Uitti said in February 2nd, 2007 at 2:34 pm

My favorite one-liner about quantum is this:

The dark adapted eye can detect a single photon (which is a quark).

So, while quantum physics is counter intuitive, and outside your normal, every day experience, it’s also something that you can see, as part of every day life.

You’d expect that light is really simple. But the greatest minds of our time have added something to the study of it.

Aristotle investigated color mixtures, by passing daylight through blue colored glass and yellow colored glass to produce a green patch on a white marble wall.

Newton investigated this further with prisms, showing that sun light can be split into the full rainbow, then recombined into white light.

Einstein’s photo electric effect paper showed that light striking a semiconductor can produce electricity. This won him the Nobel prize, and launched quantum mechanics.

Additionally, there is polarization, the speed of light, the monoton pulse, coherence, lasing, refraction, the wave/particle duality, Cherenkov Radiation, entangled photon pairs, and probably a dozen other aspects of light i’ve omitted. Quantum is like that, only more so.

If you’re interested, it’s waiting for you. Check out:
http://en.wikipedia.org/wiki/Electromagnetic_radiation

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pizorn said in February 23rd, 2007 at 3:47 pm

photons are not quarks.
yet another guy who does not know anything about quantum theory except for the “definition” of ‘quantum’. photons are light quanta and that’s about it. nothing really quantum in that except for the second quantization (which every undergrad student understands). quantum theory is much much much more. so please, dear Stephen, i would like you (as well) to stop using word quantum.

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Stephen Uitti said in February 23rd, 2007 at 4:21 pm

OK, so photons are not quarks. Sue me. They are still 1) elementary particles 2) highly complex, and 3) detectable in every day experience.

Perhaps one day, photons won’t even be elementary particles.

I’m not editing the Wikipedia entry here.

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craig said in March 6th, 2007 at 9:40 pm