A source of heralded atom-photon entanglement for quantum networking

• URL: http://arxiv.org/abs/2510.15765v2
• Date: Mon, 20 Oct 2025 09:02:00 GMT
• Title: A source of heralded atom-photon entanglement for quantum networking
• Authors: Gianvito Chiarella, Tobias Frank, Leart Zuka, Pau Farrera, Gerhard Rempe,
• Abstract summary: 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.<n>We show that heralding improves the atom-photon entanglement in-fiber efficiency and fidelity to 68(3)% and 87(2)%, respectively.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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