High Fidelity Trapped Ion Qubit Gate Operations with a Narrow-Linewidth Integrated Photonic Laser

We present the first high-fidelity (>99%) single qubit gates with trapped ions using an integrated photonic laser system, which is comprised of an integrated Stimulated Brillouin Scattering (SBS) laser locked to an integrated high-Q coil resonator. We use this integrated laser to excite an ultra-narrow clock transition in ⁸⁸Sr⁺ trapped in a surface electrode trap without the use of a conventional cavity or second harmonic generation (SHG). To overcome residual thermal drift of the integrated laser source we further discipline the laser to the ion clock transition. By interleaving clock feedback sequences with qubit control sequences, we perform Rabi oscillations that retain >99% population per inversion for rotations exceeding 10π, equivalent to single qubit gate fidelity of 99.7%. We are also able to perform state preparation and measurement with 99.75% fidelity, narrow linewidth spectroscopy (<1 kHz linewidth), resolved sideband cooling below 0.1 nbar, and measure laser limited qubit coherence times of 329 μs. These results demonstrate the first high fidelity qubit gates achieved with an integrated laser system and light the way toward highly portable, monolithically integrated, quantum information processors for sensing, networking and computing.