Are quanta real? : A Galilean dialogue by J.M. Jauch

By J.M. Jauch

"... thought-provoking and pleasant. i feel that any one attracted to nature's private secrets and techniques might locate nice stimulation during this charmingly written little gem of a book." —Douglas Hofstadter"... strange, pleasant, nonmathematical book... The reader is left in amusement and admiration." —Scientific American"This is an excellent book... " —American magazine of Physics"... this inventive work... elucidates the distinction among the classical, deterministic notions that appear inbred and the unusual habit of the microscopic quantum world.... through resurrecting Galileo's 3 questing buddies, Jauch is ready to pose questions a pupil wish to ask yet too frequently is inhibited from doing so." —The Key ReporterAn authority on either quantum mechanics and the paintings of Galileo, J. M. Jauch wrote this captivating discourse in imitation of Galileo's celebrated discussion "Two significant structures of the World." The discussion shape is fun in addition to lucrative and appeals to the coed of quantum mechanics, the thinker or historian of technological know-how, and the lay individual

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8-nm light from an emission line of a mercury arc was isolated by a system of filters and sent to a half-silvered mirror. Downstream were two photomultipliers connected to a coincidence * Even if light is composed of photons, coincidences can always arise by chance if two photons happen to arrive at the same moment. The probability of this happening decreases with the intensity of the light. All experiments must then operate at very low light levels in order to reduce this probability to negligible values.

In particular, a single letter cannot have two points of origin. Even without a return address we are confident that, with a little effort, we can trace a given letter back to its sender. If this makes sense to you, consider the following experiment, performed by Pfleegor and Mandel in 1967. 1— The Pfleefor-Mandel Experiment. Two Lasers, One Photon The light from two lasers making a very small angle with each other was incident upon a screen (Figure 3-1). The experimental arrangement was such that individual photons could be detected by sensitive photomultipliers arranged along the screen.

Similarly, is the term arising from slit 2. 16) gives the effects of combining the two waves. As we progress up along the screen, this term oscillates, yielding the characteristic maxima and minima of the interference pattern. How is this theory to be compared with the experiment- The light bands that we saw in Figure 1-3 represent areas of the detector upon which electrons are falling with a relatively great frequency—that is, areas in which the probability of finding a particle is greatest. Conversely, the dark --- --Page 16 bands are regions of low probability of finding a particle.

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