Abrupt energy flipping in a continuously observed Rabi driven quantum bit

In the presence of a periodic external drive, mean value energy two-level quantum system (or qubit) displays well-known Rabi oscillatory dynamics that is usually described within rotating wave approximation. order to calculate its standard deviation, we get rid this latter and obtain huge ratio (of unity) deviation over value. This due large-amplitude high-frequency oscillations internal as well overall phase system. continuous measurement of, say, ground state yields Zeno effect, remains frozen in long driven allows stay deviation. When reaching boundary, suddenly flips excited level further We model flip by use parametrized transitions show it can be defined result action quantization. check our theory recovering so-called “quantum jumps” published Minev et al. (2019).