On Friday, April 20, 2018 at 12:00:25 PM UTC, Bruce wrote: > > From: <[email protected] <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 [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.
