title: Coherence generation and population transfer by stimulated Raman adiabatic passage and π pulse in a four-level ladder system.
abstract: We propose a new scheme for achieving the complete population transfer and the optimal coherence generation between the ground state and the Rydberg state in a four-level ladder system by combining the STIRAP or fractional STIRAP technique and the π pulse technique. We consider, in particular, two different situations where spontaneous emission from the two highest states are neglected or not. Our numerical calculations show that the time width and the delay time of the π pulse are two critical parameters for attaining the maximal population transfer and coherence generation in this scheme.
authors.affiliation: College of Physics, Jilin University, Changchun 130023, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Zhang
authors.forename: Jin-Hui
authors.initials: JH
authors.lastname: Wu
authors.forename: Xi-Zhang
authors.initials: XZ
authors.lastname: Yan
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Xiao-Jun
authors.initials: XJ
authors.lastname: Zhang
authors.forename: Jin-Yue
authors.initials: JY
authors.lastname: Gao
mesh_terms: D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D055095:Optics and Photonics / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*