Multipartite entanglement swapping with homodyne and single photon detection
Abstract
Establishing multipartite entanglement across lossy optical networks remains a central challenge for distributed quantum information processing. Here, we consider a non-Gaussian continuous-variable entanglement-swapping protocol combining a symmetric discrete Fourier transform (DFT) interferometer with photon-number-resolving detection. In the ideal limit, single-photon heralding generates a WN-class state across remote modes, with Fourier symmetry rendering all single-click outcomes equivalent up to local phase corrections. We find that conditional pairwise entanglement can exceed that of conventional Gaussian homodyne swapping in weak-to-moderate squeezing and lossy regimes, remaining nonzero beyond the channel-loss thresholds at which Gaussian pairwise entanglement vanishes. These results demonstrate that combining non-Gaussian measurements with symmetric interferometric mixing can improve both the resilience and operational efficiency of multipartite entanglement distribution in lossy quantum networks.
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BibTeX
@misc{assaf2026multipartite,
title = {{Multipartite entanglement swapping with homodyne and single photon detection}},
author = {Tarek Assaf and Josephine Dias},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.05597},
eprint = {2611.05597},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.05597},
}
RIS
TY - UNPB
TI - Multipartite entanglement swapping with homodyne and single photon detection
AU - Tarek Assaf
AU - Josephine Dias
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2611.05597
UR - https://arxiv.org/abs/2611.05597
AB - Establishing multipartite entanglement across lossy optical networks remains a central challenge for distributed quantum information processing. Here, we consider a non-Gaussian continuous-variable entanglement-swapping protocol combining a symmetric discrete Fourier transform (DFT) interferometer with photon-number-resolving detection. In the ideal limit, single-photon heralding generates a W_N-class state across remote modes, with Fourier symmetry rendering all single-click outcomes equivalent up to local phase corrections. We find that conditional pairwise entanglement can exceed that of conventional Gaussian homodyne swapping in weak-to-moderate squeezing and lossy regimes, remaining nonzero beyond the channel-loss thresholds at which Gaussian pairwise entanglement vanishes. These results demonstrate that combining non-Gaussian measurements with symmetric interferometric mixing can improve both the resilience and operational efficiency of multipartite entanglement distribution in lossy quantum networks.
ER -