%0 Journal Article
%J Physical Review A
%D 2009
%T Dynamical control of two-level system decay and long time freezing
%A Zhang, W. X.
%A Zhuang, J.
%K decoherence
%M ISI:000266635300045
%P 012310
%R 10.1103/Physreva.79.012310
%U ://000266635300045
%V 79
%X We investigate with exact numerical calculation coherent control of a two-level quantum system's decay by subjecting the two-level system to many periodic ideal 2 pi phase modulation pulses. For three spectrum intensities (Gaussian, Lorentzian, and exponential), we find both suppression and acceleration of the decay of the two-level system, depending on difference between the spectrum peak position and the eigen frequency of the two-level system. Most interestingly, the decay of the two-level system freezes after many control pulses if the pulse delay is short. The decay freezing value is half of the decay in the first pulse delay.
%Z Part A453THTimes Cited:0Cited References Count:27
%8 01/01
%@ 1050-2947