Relaxation Of A Two-Level System: Non-Negativity Of Density Matrix And Possibility For Anomalously Long T2
Density matrix equations for the relaxation of a two-level system are studied. Standard dogma, Γik ≥ (γi + γk)/2, about the relaxation constant for the off-diagonal (Γik) and diagonal (γi) matrix elements is verified for the case of up- and down-transitions with high rates w21 and w12. Non-negativity of the density matrix imposes much weaker limitation, Γ21 ≥ (1/2)[(w21)1/2 -(w12)1/2]2. An almost 'physical' system is suggested, which describes to a certain approximation such decrease of transverse relaxation constant Γ.
Journal of Modern Optics
Number of Pages
Article; Proceedings Paper
Source API URL
Goun, A. A. and Zel'Dovich, B. Ya, "Relaxation Of A Two-Level System: Non-Negativity Of Density Matrix And Possibility For Anomalously Long T2" (2002). Scopus Export 2000s. 2609.