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OSA Student Chapter Meeting

SPEAKER: Andrew Traverso
TITLE:Backward Propagating Resonant Superfluorescence in Rb gas
At high laser intensity where the Rabi frequency becomes comparable to the linewidth of the transition, frequency sidebands are generated on either side of the resonant transition via the dynamic Stark shift. This phenomenon was first predicted in the late 60s and later observed in atomic gases in the mid 70s by various groups. In this experiment, we observed backward propagating emission that exhibited the characteristic sidebands of resonant fluorescence. Furthermore, given the intensity of the laser, we are well beyond the threshold for the strong field limit such that the rabi frequency is much larger than any of the decay/dephasing rates which is suggestive that the emission is superfluorescent as well.

SPEAKER: Sasha Zhdanova
TITLE: Fiber-Optical Switch Controlled by a Single Atom ABSTRACT:
I will be presenting the work of Danny O'Shea et al. In their paper they demonstrate highly efficient switching of optical signals between two optical fibers controlled by a single atom. The key element of the experiment is a whispering-gallery-mode bottle microresonator, which is coupled to a single atom and interfaced by two tapered fiber couplers. This system reaches the strong coupling regime of cavity quantum electrodynamics, leading to a vacuum Rabi splitting in the excitation spectrum. They systematically investigate the switching efficiency of the system, i.e., the probability that the fiber-optical switch redirects the light into the desired output. They obtain a large redirection efficiency reaching a raw fidelity of more than 60% without postselection. Moreover, by measuring the second-order correlation functions of the output fields, they show that their switch exhibits a photon-number-dependent routing capability. (Reference: PRL 111, 193601 (2013)).

Friday, November 15, 2013
IQSE 578, 12:30 noon
Mitchell Physics Building

Department of Physics and Astronomy
Institute for Quantum Science and Engineering
Texas A&M University

(Pizza lunch as usual. Newcomers welcome!)

Host: Ellie Figueroa