Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave
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arXiv
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| Format: | Preprint |
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2023
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| author | Saner, S. Băzăvan, O. Minder, M. Drmota, P. Webb, D. J. Araneda, G. Srinivas, R. Lucas, D. M. Ballance, C. J. |
| author_facet | Saner, S. Băzăvan, O. Minder, M. Drmota, P. Webb, D. J. Araneda, G. Srinivas, R. Lucas, D. M. Ballance, C. J. |
| contents | 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 $λ=674$ nm standing wave, whose relative position is controlled to $\approxλ/100$, 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 $15\ μ$s, restricted by the available laser power. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_03450 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave Saner, S. Băzăvan, O. Minder, M. Drmota, P. Webb, D. J. Araneda, G. Srinivas, R. Lucas, D. M. Ballance, C. J. Quantum Physics Atomic Physics 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 $λ=674$ nm standing wave, whose relative position is controlled to $\approxλ/100$, 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 $15\ μ$s, restricted by the available laser power. |
| title | Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2305.03450 |