On Sunday, October 28, 2018 at 9:27:56 AM UTC, Bruno Marchal wrote: > > > On 25 Oct 2018, at 17:12, [email protected] <javascript:> wrote: > > > > On Tuesday, October 23, 2018 at 10:39:11 PM UTC, [email protected] > wrote: >> >> If a system is in a superposition of states, whatever value measured, >> will be repeated if the same system is repeatedly measured. But what >> happens if the system is in a mixed state? TIA, AG >> > > If you think about it, whatever value you get on a single trial for a > mixed state, repeated on the same system, will result in the same value > measured repeatedly. If this is true, how does measurement distinguish > superposition of states, with mixed states? AG > > > That is not correct. You can distinguish a mixture of particles in the up > or down states with a set of 1/sqrt(2)(up+down) by measuring them with the > {1/sqrt(2)(up+down), 1/sqrt(2)(up-down}) discriminating apparatus. With the > mixture, half the particles will be defected in one direction, with the > pure state, they will all pass in the same direction. Superposition would > not have been discovered if that was not the case. >
*And someone will supply the apparatus measuring (up + down), and (up - down)? No such apparatuses are possible since those states are inherently contradictory. We can only measure up / down. AG* > > Bruno > > > > > > > -- > 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] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > Visit this group at https://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > > > -- 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
