title: Demonstration of a state-insensitive, compensated nanofiber trap.
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.
authors.affiliation: Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: A
authors.initials: A
authors.lastname: Goban
authors.forename: K S
authors.initials: KS
authors.lastname: Choi
authors.forename: D J
authors.initials: DJ
authors.lastname: Alton
authors.forename: D
authors.initials: D
authors.lastname: Ding
authors.forename: C
authors.initials: C
authors.lastname: Lacroûte
authors.forename: M
authors.initials: M
authors.lastname: Pototschnig
authors.forename: T
authors.initials: T
authors.lastname: Thiele
authors.forename: N P
authors.initials: NP
authors.lastname: Stern
authors.forename: H J
authors.initials: HJ
authors.lastname: Kimble