Assembly of a rovibrational ground state molecule in an optical tweezer

Abstract

We demonstrate the coherent creation of a single NaCs molecule in its rotational, vibrational, and electronic (rovibronic) ground state in an optical tweezer. Starting with a weakly bound Feshbach molecule, we locate a two-photon transition via the $|c^3\Sigma ,v^{\prime }=26⟩$ excited state and drive coherent Rabi oscillations between the Feshbach state and a single hyperfine level of the NaCs rovibronic ground state $|X^1\Sigma ,v^{\prime \prime }=0,N^{\prime \prime }=0⟩$ with a binding energy of $D_0=h\times 147038.30(2)$ GHz. We measure a lifetime of $3.4\pm 1.6$ s for the rovibronic ground-state molecule, which possesses a large molecule-frame dipole moment of 4.6 Debye and occupies predominantly the motional ground state. These long-lived, fully quantum-state-controlled individual dipolar molecules provide a key resource for molecule-based quantum simulation and information processing.

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