Addressing Two-Level Systems Variably Coupled to an Oscillating Field

We propose a simple method to spectrally resolve single-spins in a cold atomic system, thus realizing single-spin addressing. This scheme uses a dressing field with a spatially-dependent coupling to the atoms. We realize this scheme experimentally using a linear chain of trapped ions that are separated by $\sim3$ $μ$m, dressed by a laser field that is resonant with the micromotion sideband of a narrow optical transition.

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