title: Conditions to preserve quantum entanglement of quadrature fluctuation fields in electromagnetically induced transparency media.
abstract: We study the propagation of quantum fields through an electromagnetically induced transparency (EIT) medium with initially two squeezed and one coherent states. Conditions to preserve and to establish nonseparation criteria for perturbed quantized fluctuation fields are demonstrated. The results in this work provide a guideline for using EIT media as quantum light devices.
authors.affiliation: Department of Physics, National Tsing-Hua University, Hsinchu 300, Taiwan. d9622804@oz.nthu.edu.tw
authors.forename: You-Lin
authors.initials: YL
authors.lastname: Chuang
authors.forename: Ray-Kuang
authors.initials: RK
authors.lastname: Lee