Propagation of a light pulse through a high-Q optical microcavity containing a few cold atoms (N<10) in its cavity mode is investigated experimentally. With less than ten cold rubidium atoms launched into an optical microcavity, up to 170 ns propagation lead time ("superluminal"), and 440 ns propagation delay time (subluminal) are observed. Comparison of the experimental data with numerical simulations as well as future experiments are discussed.

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Complrmeataritg md intelligent ~h l e silnoltaneaos melsu-ents A. Trifonov', G. Bjiid and J. SBderholmz ' A . F . I O~~ ~h y~i~d -~e c l u t i~~f ~~t i w~, ~~r s i m , ~~d~~ of scienter 2 6 P o f p e k h n i~h 4 9~ I94021 8. Pek?mbq, I(ussio. Fa: (812/-SlS-6747, PI" (812)-115-92RR. E-ntoif:oiro&m.il.~lm. m! ' Dqwmm ofEfemnim, Royal Inshlrtle of T a c f m l o~ (KTH/ Eleu" 229,164 40 Ku1a &dmRecently, in part due to the surging intercst in q u a m information, interest has focused onnon-mnjupate obscrvsbles with a discrete, and ofen finite, cigenvalue spectrum. The simplest aamplc of such a system is a spin I12 8ystcm which iS a model syncm for a qubit. Fox such a system, a simultaneous uncertainty &tion was recently derived I.