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We employ a single trapped $^{87}$Rb atom as a sub-wavelength opticalintensity sensor, by spectroscopic measurement of the ac Stark shifts on the$F=1 \rightarrow F'=2$ hyperfine transition of the D$_{2}$ line. Thistransition experiences very small tensor light shifts, allowing a precisemeasurement of the scalar shift caused by a linearly-polarized field. A"quantum jump" technique, in which a single photon absorbed on the transitionof interest induces the scattering of hundreds of photons on a bright, closedtransition, is used to boost signal level and avoid systematic effects such asprobe-induced optical pumping. The resulting line shape is used to extract theintensity at trap focus and the atom temperature. The analogous probing methodon the $F=1 \rightarrow F'=1$ transition, in contrast, experiences strongtensor light shifts, and may be useful in Zeeman-state-resolving detection.

Precise, super-resolving intensity measurement by quantum jump spectroscopy of a single neutral atom