[Aspuru-Guzik Group List] [qip] QIP special seminar ... Monday, Nov. 21

Beth Ruskai will be giving a seminar on Monday, Nov. 21 at 4pm. Details follow. -------- Speaker:  Mary Beth Ruskai Title:  Using local additivity to find examples of superadditivity of quantum channels. Room: 6C-442, MIT. Time: 4pm, Monday November 21. Abstract:  The local additivity of minimal output entropy can be extended to local additivity of maximal relative entropy with respect to a fixed reference state. This can be exploited to test channels for superadditivity of Holevo capacity with numerical effort comparable to searching for the minimal output entropy. Local maxima which do not arise from product inputs play a key role.  Moreover, evidence of superadditivity can be found even if the additivity violation itself is too small to be seen numerically. This talk will be divided into two parts. First we sketch the Gour-Friedland proof of local additivity with several significant simplifications. Second, we describe a program to test 3-state qubit channels for superadditivity of the Holevo capacity. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip