Demonstration of a state-insensitive, compensated nanofiber trap.

A. Goban,K. S. Choi,K. S. Choi,D. J. Alton,Ding Ding,C. Lacroûte,M. Pototschnig,T. Thiele,N. P. Stern,H. Kimble

Published 2012 in Physical Review Letters

ABSTRACT

We report the experimental realization of an optical trap that localizes single Cs atoms ≃215  nm from the surface of a dielectric nanofiber. By operating at magic wavelengths for pairs of counterpropagating red- and blue-detuned trapping beams, differential scalar light shifts are eliminated, and vector shifts are suppressed by ≈250. We thereby measure an absorption linewidth Γ/2π=5.7±0.1  MHz for the Cs 6S(1/2), F=4→6P(3/2), F'=5 transition, where Γ0/2π=5.2  MHz in free space. An optical depth d≃66 is observed, corresponding to an optical depth per atom d1≃0.08. These advances provide an important capability for the implementation of functional quantum optical networks and precision atomic spectroscopy near dielectric surfaces.

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