Entangling ions with engineered light gradients
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911533861175296 |
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| author | Faorlin, Tommaso Panzl, Lorenz Grosser, Phoebe Viñas, Pablo Kahan, Alan Hörmann, Walter Joseph Weiser, Yannick Cerchiari, Giovanni Feldker, Thomas Erhard, Alexander Jacob, Georg Ulmanis, Juris Blatt, Rainer Bermudez, Alejandro Monz, Thomas |
| author_facet | Faorlin, Tommaso Panzl, Lorenz Grosser, Phoebe Viñas, Pablo Kahan, Alan Hörmann, Walter Joseph Weiser, Yannick Cerchiari, Giovanni Feldker, Thomas Erhard, Alexander Jacob, Georg Ulmanis, Juris Blatt, Rainer Bermudez, Alejandro Monz, Thomas |
| contents | Spectral crowding of collective motional modes limits the fidelity of entangling interactions in trapped-ion quantum processors by inducing off-resonant coupling to spectator modes. We introduce a geometric-phase entangling interaction driven by a transverse, time-dependent structured-light force. By applying the force in a plane orthogonal to the optical propagation direction, we reduce the effects of spectral crowding while preserving single-ion addressing. The scheme is compatible with arbitrary qubit encodings, provided that the qubit states experience a differential AC Stark shift. We experimentally realise high-fidelity two-qubit gates with error rates below $5\times10^{-3}$ in ion crystals containing up to 12 ions confined within a single potential well. These results establish gradient-field light-shift gates as a scalable approach to high-fidelity entangling generation in spectrally crowded trapped-ion systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_07548 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Entangling ions with engineered light gradients Faorlin, Tommaso Panzl, Lorenz Grosser, Phoebe Viñas, Pablo Kahan, Alan Hörmann, Walter Joseph Weiser, Yannick Cerchiari, Giovanni Feldker, Thomas Erhard, Alexander Jacob, Georg Ulmanis, Juris Blatt, Rainer Bermudez, Alejandro Monz, Thomas Quantum Physics Spectral crowding of collective motional modes limits the fidelity of entangling interactions in trapped-ion quantum processors by inducing off-resonant coupling to spectator modes. We introduce a geometric-phase entangling interaction driven by a transverse, time-dependent structured-light force. By applying the force in a plane orthogonal to the optical propagation direction, we reduce the effects of spectral crowding while preserving single-ion addressing. The scheme is compatible with arbitrary qubit encodings, provided that the qubit states experience a differential AC Stark shift. We experimentally realise high-fidelity two-qubit gates with error rates below $5\times10^{-3}$ in ion crystals containing up to 12 ions confined within a single potential well. These results establish gradient-field light-shift gates as a scalable approach to high-fidelity entangling generation in spectrally crowded trapped-ion systems. |
| title | Entangling ions with engineered light gradients |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.07548 |