Multimode Fock-State Measurements using Dispersive Shifts in a Trapped Ion
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914239997804544 |
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| author | Choi, Wonhyeong Kang, Jiyong Kim, Kyunghye You, Jaehun Lee, Kyungmin Kim, Taehyun |
| author_facet | Choi, Wonhyeong Kang, Jiyong Kim, Kyunghye You, Jaehun Lee, Kyungmin Kim, Taehyun |
| contents | Trapped ions naturally host multiple motional modes alongside long-lived spin qubits, providing a scalable multimode bosonic register. Efficiently characterizing such bosonic registers requires the ability to access many motional modes with limited spin resources. Here we introduce a single-spin, multimode measurement primitive using dispersive shifts in the far-detuned multimode Jaynes-Cummings interaction. We implement a Ramsey sequence that maps phonon-number-dependent phases onto the spin, thereby realizing a multimode spin-dependent rotation (SDR). We also introduce a selective-decoupling scheme that cancels the phase induced by the carrier AC-Stark shift while preserving the phonon-number-dependent phase induced by the dispersive shift. Using this SDR-based Ramsey sequence on a single trapped ion, we experimentally extract two-mode Fock-state distributions, perform parity-based filtering of two-mode motional states, and realize a nondestructive single-shot measurement of a single-mode Fock state via repeated filtering steps. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_04591 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Multimode Fock-State Measurements using Dispersive Shifts in a Trapped Ion Choi, Wonhyeong Kang, Jiyong Kim, Kyunghye You, Jaehun Lee, Kyungmin Kim, Taehyun Quantum Physics Trapped ions naturally host multiple motional modes alongside long-lived spin qubits, providing a scalable multimode bosonic register. Efficiently characterizing such bosonic registers requires the ability to access many motional modes with limited spin resources. Here we introduce a single-spin, multimode measurement primitive using dispersive shifts in the far-detuned multimode Jaynes-Cummings interaction. We implement a Ramsey sequence that maps phonon-number-dependent phases onto the spin, thereby realizing a multimode spin-dependent rotation (SDR). We also introduce a selective-decoupling scheme that cancels the phase induced by the carrier AC-Stark shift while preserving the phonon-number-dependent phase induced by the dispersive shift. Using this SDR-based Ramsey sequence on a single trapped ion, we experimentally extract two-mode Fock-state distributions, perform parity-based filtering of two-mode motional states, and realize a nondestructive single-shot measurement of a single-mode Fock state via repeated filtering steps. |
| title | Multimode Fock-State Measurements using Dispersive Shifts in a Trapped Ion |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2601.04591 |