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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.06515 |
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| _version_ | 1866913387362910208 |
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| author | Uysal, Mehmet T. Dusanowski, Łukasz Xu, Haitong Horvath, Sebastian P. Ourari, Salim Cava, Robert J. de Leon, Nathalie P. Thompson, Jeff D. |
| author_facet | Uysal, Mehmet T. Dusanowski, Łukasz Xu, Haitong Horvath, Sebastian P. Ourari, Salim Cava, Robert J. de Leon, Nathalie P. Thompson, Jeff D. |
| contents | Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication, distributed quantum computing and quantum-enhanced sensing and metrology. As a building block of quantum repeaters, spin-photon entanglement has been demonstrated with both atomic and solid-state qubits. However, previously demonstrated qubits with long spin coherence do not directly emit photons into the low-loss telecom band that is needed for long-distance communication. Here, we demonstrate spin-photon entanglement using a single Er$^{3+}$ ion in a solid-state crystal, integrated into a silicon nanophotonic circuit. Direct emission into the telecom band enables an entanglement rate of 1.48 Hz over 15.6 km of optical fiber, with a fidelity of 73(3)$\%$. This opens the door to large-scale quantum networks based on scalable nanophotonic devices and many spectrally multiplexed Er$^{3+}$ ions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_06515 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band Uysal, Mehmet T. Dusanowski, Łukasz Xu, Haitong Horvath, Sebastian P. Ourari, Salim Cava, Robert J. de Leon, Nathalie P. Thompson, Jeff D. Quantum Physics Long-distance quantum communication using quantum repeaters is an enabling technology for secure communication, distributed quantum computing and quantum-enhanced sensing and metrology. As a building block of quantum repeaters, spin-photon entanglement has been demonstrated with both atomic and solid-state qubits. However, previously demonstrated qubits with long spin coherence do not directly emit photons into the low-loss telecom band that is needed for long-distance communication. Here, we demonstrate spin-photon entanglement using a single Er$^{3+}$ ion in a solid-state crystal, integrated into a silicon nanophotonic circuit. Direct emission into the telecom band enables an entanglement rate of 1.48 Hz over 15.6 km of optical fiber, with a fidelity of 73(3)$\%$. This opens the door to large-scale quantum networks based on scalable nanophotonic devices and many spectrally multiplexed Er$^{3+}$ ions. |
| title | Spin-photon entanglement of a single Er$^{3+}$ ion in the telecom band |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.06515 |