SPECIFIC FEATURES OF THE INTERFERENCE OF NONCLASSICAL LIGHT-BEAMS

Specific features of the interference of nonclassical light beams are discussed. It is shown that these features are manifested at observation times less than the coherence times of the beams. It is stated that interference may disappear because of ''quantum'' causes after one instantaneous observation (photographing) of the interference pattern. A quantum coherent state with a diffusing phase, corresponding (in the sense of the correspondence principle) to classical oscillations with phase diffusion, is constructed. The analogy between nonclassical states and classical oscillations with phase diffusion is stated to be unjustified.