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

• URL: http://arxiv.org/abs/2305.03450v2
• Date: Thu, 19 Oct 2023 15:36:59 GMT
• Title: Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave
• Authors: S. Saner, O. B\u{a}z\u{a}van, M. Minder, P. Drmota, D. J. Webb, G. Araneda, R. Srinivas, D. M. Lucas, C. J. Ballance
• Abstract summary: Laser-driven entangling operations for trapped-ion qubits have hitherto been performed without control of the optical phase of the light field. We suppress the carrier coupling by a factor of $18$, while coherently enhancing the spin-motion coupling. We demonstrate that the off-resonant carrier coupling imposes a speed limit for conventional traveling-wave Molmer-Sorensen gates.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• 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 M{\o}lmer-S{\o}rensen 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.

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