Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave

Abstract

All laser-driven entangling operations for trapped-ion qubits have hitherto been performed without control of the optical phase of the light field, which precludes independent tuning of the carrier and motional coupling. By placing ${}^{88}$Sr${}^{+}$ ions in a $\lambda =674$ nm standing wave, whose relative position is controlled to $\approx \lambda /100$, we suppress the carrier coupling by a factor of $18$, while coherently enhancing the spin-motion coupling. We experimentally demonstrate that the off-resonant carrier coupling imposes a speed limit for conventional traveling-wave Mølmer-Sørensen gates; we use the standing wave to surpass this limit and achieve a gate duration of $15\mu$s, restricted by the available laser power.

arXiv commentS. Saner and O. Băzăvan contributed equally to this work

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• Trapped-ion laser cooling in structured light fields
• High-speed and high-connectivity two-qubit gates in long chains of trapped ions
• Fast Mølmer-Sørensen gates in trapped-ion quantum processors with compensated carrier transition
• Quantum computing architecture with Rydberg gates in trapped ions
• Error-Resilient Fast Entangling Gates for Scalable Ion-Trap Quantum Processors