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We consider two atoms individually trapped in optical tweezers, both initially in the electronic ground state. Travelling light emitted from a global laser beam applies a /2 rotation to both atoms, and is disabled, but remains phase coherent with the atomic transition. One of the atoms is then moved by half the laser wavelength ( λ ) from its initial position, rotating the effective local laser frame by an angle ϕ = π. When the laser drive is restarted to apply another /2 pulse, the moved atom now rotates back to the ground state, whereas the static atom rotates to the excited state.

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