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We report the creation of ultracold ground state$^{6}\textrm{Li}^{40}\textrm{K}$ polar molecules with high efficiency. Startingfrom weakly-bound molecules state, stimulated Raman adiabatic passage (STIRAP)is adopted to coherently transfer the molecules to their singlet ro-vibrationalground state $|\textrm{X}^{1}\Sigma^{+},v=0,J=0>$. By employing a singletSTIRAP pathway and low-phase-noise narrow-linewidth lasers, we observed aone-way transfer efficiency of 96(4)\,\%. Held in an optical dipole trap, thelifetime of the ground-state molecules is measured to be 5.0(3)\,ms. The largepermanent dipole moment of LiK is confirmed by applying a DC electric field onthe molecules and performing Stark shift spectroscopy of the ground state. Withrecent advances in the quantum control of collisions, our work paves the wayfor exploring quantum many-body physics with strongly-interacting$^{6}\textrm{Li}^{40}\textrm{K}$ molecules.

Efficient Creation of Ultracold Ground State $^{6}\textrm{Li}^{40}\textrm{K}$ Polar Molecules