Generation and application of broadband biphoton fields (brief review)

Biphoton fields obtained in spontaneous parametric down-conversion are among the main tools of modern quantum optics. Temporal correlations between photons in the pair play a key role; the broader the spectrum of the biphoton field, the stronger the correlations. Broadband biphoton fields and their main characteristics have been described in detail, their possible applications have been listed, and the main methods of their generation have been presented.