  Since the introduction of higher order nonclassical effects, higher order
squeezing has been reported in a number of different physical systems but
higher order antibunching is predicted only in three particular cases. In the
present work, we have shown that the higher order antibunching is not a rare
phenomenon rather it can be seen in many simple optical processes. To establish
our claim, we have shown it in six wave mixing process, four wave mixing
process and in second harmonic generation process.
