Hello. I've got childish question. I know that quantum computers are more effective than classical ones in solving some problems. Naturally, a thought have come to me: are there computers which are more effective than quantum ones, maybe some "Superstring" computers? And maybe there are computers which are more effective than Superstring computers? And so foth, ad infinitum. I tried to search on the Internet for "superstring computers" with no result. Accidentally on the site of John Preskill I've found a talk on "quantum computation and the future of physics". Here are Preskill's words from this talk: "Can a quantum computer simulate M theory efficiently? Perhaps not, because of M-theory inherent nonlocality. E.g., a quantum system described by M-theory may have no natural tensor product decomposition into smaller systems. Thus, M-theory may be a more powerful computational model." :surprised So I decided to ask you, what do you think about all this?