On Sat, Mar 5, 2022 at 12:54 PM John Clark <[email protected]> wrote:
> On Fri, Mar 4, 2022 at 8:11 PM Bruce Kellett <[email protected]> > wrote: > >> >> Just answer me 2 questions. >>> >>> 1) If Schrodinger's equation not only allows but insists that >>> conservation of spin be violated as you claim >>> >> >> *> That is not the claim I made.* >> > > Like hell it wasn't! What I said was "The outcome of the experiment can > only be up-down or down-up, up-up and down-down NEVER happens" you > responded with "T*hat is what you are required to explain. The > Schrodinger equation certainly allows, in fact, requires, all four branches > to be present*". Now I know that anybody can have a brain fart, and if > that's what it was I won't speak about it again, but don't tell me that > wasn't the claim you made because that is bullshit. > > >> *> I said "The Schrodinger equation certainly allows, in fact, requires, >> all four branches to be present * >> > > Yes, that's what you said. And if Schrodinger equation allowed ( or even > demand according to you) that the conservation of spin be violated then no > respectable physicist would touch Schrodinger's equation with a 10 foot > pole. But of course it isn't true. > > >* I**f the measurements Alice and Bob make are independent." You >> dishonestly deleted the last part of this statement. If the measurements >> are independent,* >> > > And that is more nonsense, if the particles are in entangled, as they > must be if you wish to perform any Bell type experiment , then the > particles can't be independent, because that's what entangled means > > > When the measurements are not independent, as when Alice and Bob >> measure a pair of entangled spin zero particles, then only two branches >> are present if the polarizers are parallel (but all four branches are >> present if the polarizers are not parallel). >> > > So now you're claiming if the polarizers are not parallel then the law of > conservation of spin is violated, you're claiming that a zero spin > particle could decay into 2 spin up particles, and that is pure > unadulterated extra-virgin bullshit. > I think you need to brush up on some elementary quantum mechanics. If the polarizers are not parallel (at a relative angle theta) then the probability of an up-up result for Alice and Bob's measurements is given by sin^2(theta/2). Since up-up and down-down results are possible for non-aligned polarizers, all four branches are present in this general case. This does not involve a violation of angular momentum, and more than a z-spin up result from measuring a particle prepared with x-spin up violates angular momentum conservation. Bruce -- 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/CAFxXSLSvAdZg29PSQHrTmDjMJz-Zn79uD4jqL%2B7TNeGp1KX7cw%40mail.gmail.com.
