The GHZ state is a four state entanglement. The symmetry is a bit more complicated. The entanglement is a quotient state and a typical form is
G/H = SO(8)/SO(4)xSO(4) in 16 dimensions. This in a rule of thumb way captures the 2^4 possible state configurations. The GHZ state then gives a larger set of probability polynomials, but in the end it really gives much the same result as the standard EPR binomial entanglement. We can say in some sense that maybe there is some reality to the evolution of a quantum system, but we have no way of unobtrusively accessing that reality. If we verify the evolution of the state we lose its coherence. Even with quantum erasers or weak measurements there is some obtrusion. LC On Friday, December 1, 2017 at 4:25:17 AM UTC-6, scerir wrote: > > BTW, how is this [1] [2] intensionality, or contextuality, or wholeness, > or undecidibility, or whatever - and related difficulties regarding the > existence of "elements of reality" [3] - understandable within (postulates > of) Quantum Mechanics (and especially within ontological interpretations > like MWI)? > > [1] https://arxiv.org/abs/0712.0921 > > [2] http://www.math.zju.edu.cn/wjd/notespapers/3-2.pdf > > [3] “”if, without in any way disturbing a system, we can predict with > certainty (i.e., a probability equal to unity) the value of a > physical quantity, then there exists an element of physical reality > corresponding to this physical quantity.” ---EPR > -- 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.
