Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914302498177024 |
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| author | Zalewski, Mika A. Wu, Denton Ferrari, Ana Luiza Xie, Yuanheng Linke, Norbert M. |
| author_facet | Zalewski, Mika A. Wu, Denton Ferrari, Ana Luiza Xie, Yuanheng Linke, Norbert M. |
| contents | We demonstrate entanglement between the polarization of an infrared photon and a metastable $^{88}$Sr$^+$ ion qubit. This entanglement persists after transmitting the photon over a $2.8\:$km long commercial fiber deployed in an urban environment. Tomography of the ion-photon entangled state yields a fidelity of $0.949(4)$ within the laboratory and $0.929(5)$ after fiber transmission, not corrected for readout errors. Our results establish the Strontium ion as a promising candidate for metropolitan-scale quantum networking based on an atomic transition at $1092\:$nm, a wavelength compatible with existing telecom fiber infrastructure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_11257 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit Zalewski, Mika A. Wu, Denton Ferrari, Ana Luiza Xie, Yuanheng Linke, Norbert M. Quantum Physics Atomic Physics We demonstrate entanglement between the polarization of an infrared photon and a metastable $^{88}$Sr$^+$ ion qubit. This entanglement persists after transmitting the photon over a $2.8\:$km long commercial fiber deployed in an urban environment. Tomography of the ion-photon entangled state yields a fidelity of $0.949(4)$ within the laboratory and $0.929(5)$ after fiber transmission, not corrected for readout errors. Our results establish the Strontium ion as a promising candidate for metropolitan-scale quantum networking based on an atomic transition at $1092\:$nm, a wavelength compatible with existing telecom fiber infrastructure. |
| title | Kilometer-Scale Ion-Photon Entanglement with a Metastable $^{88}$Sr$^{+}$ Qubit |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2506.11257 |