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Experimental realizations of two qubit entangling gates with trapped ionstypically rely on addressing spectroscopically resolved motional sidebands,limiting gate speed to the secular frequency. Fast entangling gates usingultrafast pulsed lasers overcome this speed limit. This approach is based onstate-dependent photon recoil kicks from a sequence of counter-propagating,resonant, ultrafast pulse pairs, which can allow sub-microsecond gate speeds.Here we demonstrate a key component of the ultrafast gate protocol, thecoherent excitation of a 171Yb+ ion across the 2S1/2-2P1/2 transition with asingle near-resonant short optical pulse at 369.53 nm. We achieve a maximumpopulation transfer of 94.3(6)% using a picosecond pulsed laser that can betuned across the 2S1/2-2P1/2 transition, and 42.53(13)% with 190(7) GHzdetuning.

Ultrafast coherent excitation of an Ytterbium ion with single laser pulses