Shameless plug; a while ago I wrote a very similar library [1] using CUDA. Unlike this library, it does not allow for a sparse representation of the state vect

Shameless plug; a while ago I wrote a very similar library [1] using CUDA. Unlike this library, it does not allow for a sparse representation of the state vector; but for maximally entangled states it's pretty efficient (as fast as memory allows). I've tested it up to 28 qubits. But fair warning; it's very much undocumented and a toy. [1] http://hub.darcs.net/squirrel/quantum http://hub.darcs.net/squirrel/quantum