Phys. Rev. A 65, 033833 (2002) [4 pages]Symmetric photon-photon coupling by atoms with Zeeman-split sublevelsReceived 11 May 2001; published 1 March 2002 We propose a simple scheme for highly efficient nonlinear interaction between two weak optical fields. The scheme is based on the attainment of electromagnetically induced transparency simultaneously for both fields via transitions between magnetically split F=1 atomic sublevels, in the presence of two driving fields. Thereby, equal slow group velocities and symmetric cross coupling of the weak fields over long distances are achieved. By simply tuning the fields, this scheme can either yield giant cross-phase modulation or ultrasensitive two-photon switching. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.033833
DOI:
10.1103/PhysRevA.65.033833
PACS:
42.50.Gy, 03.67.-a
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