<正> The entanglement capacity of general two-qubit unitary operators is studied when auxiliary systems areallowed,and the analytical results based on linear en
<正> The entropy squeezing properties for a two-level atom interacting with a two-mode field via two differentcompeting transitions are investigated from a quan
【正】 A new higher-dimensional Lie algebra is constructed,which is used to generate multiple integrable couplingssimultaneously.From this,we come to a general