Hidden Variables: Value and Expectation No-Go Theorems Yuri Gurevich, Microsoft Research Time: Tuesday October 6, 11AM Place: Kiva, 32-G449 Host: Scott Aaronson No-go theorems assert that hidden-variable theories, subject to appropriate hypotheses, cannot reproduce the predictions of quantum theory. We examine two species of such theorems, value no-go theorems and expectation no-go theorems. The former assert that hidden-variables cannot match the predictions of quantum theory about the possible values resulting from measurements; the latter assert that hidden-variables cannot match the predictions of quantum theory about the expectation values of measurements. We sharpen the known results of both species, which allows us to clarify the similarities and differences between the two species. We also repair some flaws in existing definitions and proofs. This is joint work with Andreas Blass of the University of Michigan. The paper can be found at arXiv:1509.06896. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip