On Saturday, September 21, 2019 at 10:43:57 AM UTC-6, smitra wrote: > > On 21-09-2019 14:52, Alan Grayson wrote: > > On Saturday, September 21, 2019 at 6:40:50 AM UTC-6, John Clark wrote: > > > >> On Sat, Sep 21, 2019 at 8:29 AM Alan Grayson <[email protected]> > >> wrote: > >> > >>> _> What I don't understand is why a computer programmed to assume > >>> a superposition, say of two states, represents a system in both > >>> states simultaneously (which I find to be false for reasons > >>> previously stated), would speed up any calculation. Can anyone > >>> answer this question? AG _ > >> > >> Well, if you're right about superposition then a Quantum Computer > >> can't speed up a calculation, therefore if this rumor turns out to > >> be true that would prove you are not right about superposition. > >> > >> John K Clark > > > > My question is a conceptual one; why would assuming a superposition > > means what I earlier stated, speed up any calulation? AG > > > > Richard Feynman who invented the conceptional idea of a quantum computer > had answered this question long before quantum algorithms that are used > today were invented. He simply argued that it the time it takes for a > classical computation to compute the properties of an interacting > quantum system with N degrees of freedom, increases exponentially as a > function of N. So, if a classical computer is running a particular > algorithm that can be mathematically shown to be equivalent to computing > a property of an N part quantum system, then you could just build that > quantum system and measure that property. One can then consider doing > that in a more practical way by constructing a universal quantum > computing device. > > Saibal >
What are you claiming; that a quantum computer isn't really designed to calculate anything, but rather simulates some quantum system? It's still above my pay grade unfortunately. AG -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/9245da6f-266f-4205-81e0-68795d1a376c%40googlegroups.com.
