If you've never seen Damian give his talk on Quantum::Superpostions then I can highly recommend it if he is able to give one in your area. Damian came to London and gave all of London.pm a quick talk on all of this. It involved many Mars bars. It was very funny.
The module itself supposes a form of quantum computer was available and creates an interface that can be used to do complex calculations in constant times by combining the superpositions of states. Imagine having a scalar that represents every element of a list simultaneously. And checking if an element in the list only takes constant time - it's no longer related to the length of the list. Spooky
Of course quantum computers aren't an everyday occurrence yet (no matter what
Until then, we're left with a module that is actually capable of doing some rather nice set calculations in a reasonably unambiguous way. It's also really easy to map predicate logic onto Q::S scalars, so it might even prove to be useful in that manner - but don't tell anyone I told you so