On Friday, April 20, 2018 at 12:00:25 PM UTC, Bruce wrote: > > From: <agrays...@gmail.com <javascript:>> > > > > *Does entanglement -- which occurs whenever two systems interact -- imply > non-locality? AG* > > > Not necessarily. If there is a common cause explanation of the > correlation, as in classical physics where particles always have definite > momenta, then there is no need for a non-local explanation. However, in > quantum systems such as the singlet state of entangled spinors, then no > common cause or hidden variable explanation is available and we have > non-locality. > > Actually a similar thing happens in any collision between two quantum > particles. If we assume an elastic collision, the outgoing particles will > be in the form of outgoing spherical waves -- neither the individual > momenta or directions are specified by the collision itself. So observing > the direction and/or momentum of one particle determines the direction and > momentum of the other remote particle. There is no common cause or hidden > variable explanation available for this, especially if the observations are > at space-like separations. However, as far as I know there are no Bell-like > inequalities that are violated by the statistics in this case, >
Shouldn't there be such violations? AG > so the non-locality is not always obvious. Interestingly, this forms the > basis for an important measurement tool at high energy accelerators. Often > the output from experiments will be in the form of a missing mass plot, > which is constructed by summing the momenta of the observed particles and > determining what is missing. This can then be the basis of a search for > undetectable or new particles. > > 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
