RT Journal Article
T1 Superluminal and slow light in Lambda-type three-level atoms via squeezed vacuum and spontaneously generated coherence
A1 Carreño Sánchez, Fernando
A1 Gómez Calderón, Óscar
A1 Antón Revilla, Miguel Ángel
A1 Gonzalo Fonrodona, Isabel
AB We study the dispersion and absorption spectra of a weak probe in a Delta-type three-level atomic system with closely ground sublevels driven by a strong field and damped by a broadband squeezed vacuum. We analyze the interplay between the spontaneous generated coherence and the squeezed field on the susceptibility of the atomic system. We find that by varying the intensity of the squeezed field the group velocity of a weak pulse can change from subluminal to superluminal. In addition we exploit the fact that the properties of the atomic medium can be dramatically modified by controlling the relative phase between the driving field and the squeezed field, allowing us to manipulate the group velocity at which light propagates. The physical origin of this phenomenon corresponds to a transfer of the atomic coherence from electromagnetically induced transparency to electromagnetically induced absorption. Besides, this phenomenon is achieved under nearly transparency conditions and with negligible distortion of the propagation pulse.
PB American Physical Society
SN 1050-2947
YR 2005
FD 2005-06-15
LK https://hdl.handle.net/20.500.14352/51352
UL https://hdl.handle.net/20.500.14352/51352
LA eng
NO ©2005 The American Physical Society. This work was supported by Project Nos. PR3/04-12458 (U.C.M., Spain) and FIS2004-03267 (M.E.C, Spain).
NO Universidad Complutense de Madrid (UCM)
NO Ministerio de Educación y Ciencia (MEC), España
DS Docta Complutense
RD 9 abr 2025