The Uncertainty Principle in Classical Optics
نویسنده
چکیده
expand as they propagate along Z and, although their centers drift apart, there is the distinct possibility that they will never be completely separated. Roughly speaking, we expect the beams to remain more or less collimated between z = 0 and z = D2/ , the Rayleigh range2 for a beam of diameter D and wavelength . If at the Rayleigh range the distance between the beam centers is greater than D, the beams should be separable; otherwise their drifting apart will go hand in hand with their expansion, and the beams remain entangled as they propagate beyond the Rayleigh range. The necessary condition for separability is thus (D2/ ) > D, or equivalently,
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