A source of heralded atom-photon entanglement for quantum networking
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911311140487168 |
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| author | Chiarella, Gianvito Frank, Tobias Zuka, Leart Farrera, Pau Rempe, Gerhard |
| author_facet | Chiarella, Gianvito Frank, Tobias Zuka, Leart Farrera, Pau Rempe, Gerhard |
| contents | Communication in quantum networks suffers notoriously from photon loss. Resulting errors can be mitigated with a suitable measurement herald at the receiving node. However, waiting for a herald and communicating the measurement result back to the sender in a repeat-until-success strategy makes the protocol slow and prone to errors from false heralds such as detector dark counts. Here we implement an entanglement herald at the sending node by employing a cascaded two-photon emission of a single atom into two optical fiber cavities: The polarization of one photon is entangled with the spin of the atom, and the second photon heralds entanglement generation. We show that heralding improves the atom-photon entanglement in-fiber efficiency and fidelity to 68(3)% and 87(2)%, respectively. We highlight the potential of our source for noise-limited long-distance quantum communication by extending the range for constant fidelity or, alternatively, increasing the fidelity for a given distance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15765 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A source of heralded atom-photon entanglement for quantum networking Chiarella, Gianvito Frank, Tobias Zuka, Leart Farrera, Pau Rempe, Gerhard Quantum Physics Communication in quantum networks suffers notoriously from photon loss. Resulting errors can be mitigated with a suitable measurement herald at the receiving node. However, waiting for a herald and communicating the measurement result back to the sender in a repeat-until-success strategy makes the protocol slow and prone to errors from false heralds such as detector dark counts. Here we implement an entanglement herald at the sending node by employing a cascaded two-photon emission of a single atom into two optical fiber cavities: The polarization of one photon is entangled with the spin of the atom, and the second photon heralds entanglement generation. We show that heralding improves the atom-photon entanglement in-fiber efficiency and fidelity to 68(3)% and 87(2)%, respectively. We highlight the potential of our source for noise-limited long-distance quantum communication by extending the range for constant fidelity or, alternatively, increasing the fidelity for a given distance. |
| title | A source of heralded atom-photon entanglement for quantum networking |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2510.15765 |