  Entanglement generation in trapped-ion systems has relied thus far on two
distinct but related geometric phase gate techniques: Molmer-Sorensen and
light-shift gates. We recently proposed a variant of the light-shift scheme
where the qubit levels are separated by an optical frequency [B. C. Sawyer and
K. R. Brown, Phys. Rev. A 103, 022427 (2021)]. Here we report an experimental
demonstration of this entangling gate using a pair of $^{40}$Ca$^+$ ions in a
cryogenic surface-electrode ion trap and a commercial, high-power, 532 nm
Nd:YAG laser. Generating a Bell state in 35 $\mu$s, we directly measure an
infidelity of $6(3) \times 10^{-4}$ without subtraction of experimental errors.
The 532 nm gate laser wavelength suppresses intrinsic photon scattering error
to $\sim 1 \times 10^{-5}$.
