Quantum optics is concerned with the emission, propagation and detection of photons. These words bring to mind the picture of photons as particles traveling through space at speed c from the emitter to the detector. If this picture is approximately correct, then one is entitled to ask for: (I) the number of photons in a given volume V, and (II) the number of photons that cross a given surface S in the time interval [t, t+T].
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- 4.An operator which is equivalent to (17) in the limit λ <<l was introduced by L. Mandel, Phys. Rev. 144, 1071 (1966).Google Scholar
- 6.R.J. Glauber, in Quantum Optics and Electronics, edited by C. DeWitt, A. Blandin, and C. Cohen-Tannoudji ( Gordon and Breach Science Publishers, Inc., New York, 1965 ), pp. 78–81.Google Scholar