Title

Relaxation Of A Two-Level System: Non-Negativity Of Density Matrix And Possibility For Anomalously Long T2

Abstract

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.

Publication Date

3-10-2002

Publication Title

Journal of Modern Optics

Volume

49

Issue

3-4

Number of Pages

503-509

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/09500340110090792

Socpus ID

0037051304 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0037051304

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