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We examine the interaction of a weak probe with $N$ atoms in a lambda-levelconfiguration under the conditions of electromagnetically induced transparency(EIT). In contrast to previous works on EIT, we calculate the output state ofthe resultant slowly propagating light field while taking into account theeffects of ground state dephasing and atomic noise for a more realistic model.In particular, we propose two experiments using slow light with a nonclassicalprobe field and show that two properties of the probe, entanglement andsqueezing, characterizing the quantum state of the probe field, can bewell-preserved throughout the passage.Comment: 2 figures; v2: fixed some minor typographical errors in a couple of  equations and corrected author spelling in one reference. v3: Added three  authors; changed the entaglement definition to conform to a more accepted  standard (Duan's entanglement measure); altered the abstract slightly. v4:  fixed formatting of figure

Squeezing and entanglement delay using slow light