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Fiber-optical switch controlled by a single atom

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arxiv 1306.1357 v2 pith:OGZNQNSD submitted 2013-06-06 quant-ph

Fiber-optical switch controlled by a single atom

classification quant-ph
keywords atomsinglecontrolledcouplingcqedefficiencyfiber-opticalfibers
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We demonstrate highly efficient switching of optical signals between two optical fibers controlled by a single atom. The key element of our experiment is a whispering-gallery mode bottle microresonator, which is coupled to a single atom and interfaced by two tapered fiber couplers. Even in the presence of the coupling fibers, the atom--resonator system reaches the strong coupling regime of cavity quantum electrodynamics (CQED), leading to a vacuum Rabi splitting in the excitation spectrum. We systematically investigate the switching efficiency of our system, i.e., the probability that the CQED fiber-optical switch redirects the light into the desired output. We obtain a large redirection efficiency reaching a raw fidelity of more than 60% without post-selection.

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