On Fri, Aug 9, 2019 at 3:16 PM smitra <[email protected]> wrote: > On 09-08-2019 05:35, Bruce Kellett wrote: > > > It is really quite simple. If a state is a sum of two components, > > |psi> = (|A> + |B>), then we measure <psi|psi> = (<A| + <B|)(|A> + > > |B>) = <A|A> + <B|B> + 2<A|B>. If <A|B> does not vanish (the > > components are not orthogonal), then there is interference. For > > orthogonal components <A|B> = 0, and there is no interference. > > Introducing separate states for the two slits does not aid > > comprehension here. > > Nonsense.
What is nonsense? The fact that separate states for the two slits does not aid comprehension? Or the fact that orthogonal states do not interfere? What we observe at a point x on the screen is the expectation > value of the projection operator |x><x|. No, we don't observe an expectation value, which is a weighted average over possible outcomes. We measure a particular outcome at each point on the screen. Bruce > The two states are orthogonal, > but that doesn't matter one iota, we always measure the modulus squared > of the inner product of the state with |x>. > > Saibal > -- 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/CAFxXSLRbx0Wr8n30g7XPP0KoR1%2Bzicb3FTpJQTKRpmCQrmCC0Q%40mail.gmail.com.
