Relaxation of a two-level system: non-negativity of density matrix and possibility for anomalously long T-2
Abbreviated Journal Title
J. Mod. Opt.
Density matrix equations for the relaxation of a two-level system are studied. Standard dogma, Gamma(ik) greater than or equal to (gamma(i) + gamma(k))/2, about the relaxation constant for the off-diagonal (Gamma(ik)) and diagonal (gamma(i)) matrix elements is verified for the case of up- and down-transitions with high rates w(21) and w(12). Non-negativity of the density matrix imposes much weaker limitation, Gamma(21) greater than or equal to (1/2)[(w(21))(1/2) -(w(12))(1/2)](2). An almost 'physical' system is suggested, which describes to a certain approximation such decrease of transverse relaxation constant Gamma.
Journal of Modern Optics
Article; Proceedings Paper
"Relaxation of a two-level system: non-negativity of density matrix and possibility for anomalously long T-2" (2002). Faculty Bibliography 2000s. 3230.