00672nas a2200145   4500000000100000000000100001000000100002008004100003100002300044700002200067245005600089300001100145490000700156520036300163       2011                            d1 aBartłomiej Gardas1 aZbigniew Puchała00aStationary states of two-level open quantum systems  a2153060 v443 a<p>A problem of finding stationary states of open quantum systems is addressed. We focus our attention on a generic type of open system: a qubit coupled to its environment. We apply the theory of block operator matrices and find stationary states of two-level open quantum systems under certain conditions applied on both the qubit and the surrounding.</p>