Dynamical control of two-level system decay and long time freezing

TitleDynamical control of two-level system decay and long time freezing
Publication TypeJournal Article
Year of Publication2009
AuthorsZhang WX, Zhuang J
Journal TitlePhysical Review A
Date PublishedJan
ISBN Number1050-2947
Accession NumberISI:000262979000045
Keywordsdecoherence, matrix algebra, numerical analysis, phase modulation, quantum theory

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.

URL<Go to ISI>://000262979000045