Lov Grover did find a quantum algorithm that works on general NP problems but that algorithm only achieves a quadratic speed-up and we have evidence that those

Lov Grover did find a quantum algorithm that works on general NP problems but that algorithm only achieves a quadratic speed-up and we have evidence that those techniques will not go further. from this article: http://cacm.acm.org/magazines/2009/9/38904-the-status-of-the-p-versus-np-problem/fulltext http://cacm.acm.org/magazines/2009/9/38904-the-status-of-the...