Coherent states are quasi-classical states that may be defined in different ways, for instance as eigenstates of the annihilation operator or as a displacement from the vacuum where
is the Sudarshan-Glauber displacement operator.
[1] One may think of a non-linear coherent state [2] by generalizing the annihilation operator: and then using any of the above definitions by exchanging
-deformed annihilation operator.
[3][4] This quantum mechanics-related article is a stub.