Hashizume, Yoichiro; Suzuki, Masuo - In: Physica A: Statistical Mechanics and its Applications 392 (2013) 17, pp. 3518-3530
initial states. For our new treatment, we define an extended density matrix on the double Hilbert space. From this study, we … make a general formulation of this extended density matrix and examine some simple cases using this formulation …
