Boosted Entanglement Swapping
Abstract
Entanglement swapping entangles photons that never interacted directly. When implemented with linear optics, its success probability is upper bounded by 50%, due to the limited efficiency of linear-optical Bell-state measurements. Here, we demonstrate boosted entanglement swapping using an ancilla-assisted linear-optical Bell-state measurement, which raises the theoretical success probability to 62.5% and allows all four Bell states to be identified. We measure an acceptance rate of pab=(69.39±0.39)% with an average fidelity of the swapped states of ⟨ Fb⟩=(76.6±1.0)%. We implement this protocol using photons at 1550 nm, making it well suited for quantum repeaters, where it could enable more efficient entanglement distribution. Beyond quantum communication, it could also enhance fusion-based quantum computing.
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BibTeX
@misc{bayerbach2026boosted,
title = {{Boosted Entanglement Swapping}},
author = {Matthias J. Bayerbach and Simone E. D'Aurelio and Stefanie Barz},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.05497},
eprint = {2611.05497},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.05497},
}
RIS
TY - UNPB
TI - Boosted Entanglement Swapping
AU - Matthias J. Bayerbach
AU - Simone E. D'Aurelio
AU - Stefanie Barz
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2611.05497
UR - https://arxiv.org/abs/2611.05497
AB - Entanglement swapping entangles photons that never interacted directly. When implemented with linear optics, its success probability is upper bounded by 50%, due to the limited efficiency of linear-optical Bell-state measurements. Here, we demonstrate boosted entanglement swapping using an ancilla-assisted linear-optical Bell-state measurement, which raises the theoretical success probability to 62.5% and allows all four Bell states to be identified. We measure an acceptance rate of p_a^b=(69.39±0.39)% with an average fidelity of the swapped states of ⟨ F^b⟩=(76.6±1.0)%. We implement this protocol using photons at 1550 nm, making it well suited for quantum repeaters, where it could enable more efficient entanglement distribution. Beyond quantum communication, it could also enhance fusion-based quantum computing.
ER -