Please take into account the new comments brought forward by the new Reviewer. This accept decision is somewhat conditional on the fact that you will include more clearly these references in the final version of the paper. We strongly urge you to do so, and trust you on this, because at this point, without these references and a more clear discussion of what has been considered by other authors, the paper in its current form would be a borderline reject. Please spend at least 1/2 a page clarifying connections with prior quantum W work.