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We demonstrate the coherent creation of a single NaCs molecule in itsrotational, vibrational, and electronic (rovibronic) ground state in an opticaltweezer. Starting with a weakly bound Feshbach molecule, we locate a two-photontransition via the $|{c^3\Sigma,v'=26}\rangle$ excited state and drive coherentRabi oscillations between the Feshbach state and a single hyperfine level ofthe NaCs rovibronic ground state $|{X^1\Sigma,v''=0,N''=0}\rangle$ with abinding energy of $D_0 = h \times 147038.30(2)$ GHz. We measure a lifetime of$3.4\pm1.6$ s for the rovibronic ground-state molecule, which possesses a largemolecule-frame dipole moment of 4.6 Debye and occupies predominantly themotional ground state. These long-lived, fully quantum-state-controlledindividual dipolar molecules provide a key resource for molecule-based quantumsimulation and information processing.

Assembly of a rovibrational ground state molecule in an optical tweezer