2015/09/23 by Xiaobao Liu, Zehua Tian, Jieci Wang +1 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1016/j.aop.2015.12.010
published as Annals of Physics, 366 (2016) 102-112 · 7 pages, 2 figures
arxiv created 2015/09/23 · arxiv updated 2016/03/23
In the framework of open quantum systems, we study the dynamics of a static polarizable two-level atom interacting with a bath of fluctuating vacuum electromagnetic field and explore under which conditions the coherence of the open quantum system is unaffected by the environment totally. For both a single-qubit and two-qubit systems, we find that the quantum coherence can not be protected from noise when the atom interacts with a non-boundary electromagnetic field. However, with the presence of a boundary, the dynamical conditions for the insusceptible of quantum coherence are fulfilled only when the atom is close to the boundary and is transversely polarizable. Otherwise, the quantum coherence can only be protected in some degree in other polarizable direction.