r ^ HERE are, of course, problems in the interpretation of all historical mortalities, but those surrounding maternal mortality show some unusual and rather complicated features, and they illustrate some interesting points concerning what one might call the "mechanics" of death registration in the past. For the most part, I deal here with the Registrar General's statistics for England and Wales...

In the adiabatic perturbation theory, Berry curvature is related to generalized force, and quantum metric tensor linked with energy fluctuation. While former tested numerous numerical results experimental realizations, latter less considered. Quantum Fisher information, key precision measurement, four times tensor. It difficult relate information some physical observable. One interesting candid...

The large capacity and robustness of information encoding in the temporal mode photons is important quantum processing, which characterizing states with high usability time resolution essential. We propose demonstrate a direct measurement method complex wavefunctions for weak light at single-photon level subpicosecond resolution. Our realized by ultrafast metrology interference between under te...