quantum chaos

[MathematicalPhysicist]

can someone please explain me in a layman (or even in elaborative manner) way, what is quantum chaos?

[Careful]

can someone please explain me in a layman (or even in elaborative manner) way, what is quantum chaos?
First ask yourself what classical chaos is and then apply this concept at the level of expectation values of quantum observables (at least that is my natural guess).

Cheers,

Careful