Low-nonlinearity advantage of hollow-core fiber for wavelength multiplexing of quantum entanglement and classical DWDM signals
Abstract
Coexistence of classical and quantum light in optical fiber is a key requirement for scalable quantum networks. However, it is fundamentally limited by nonlinear crosstalk from intense classical signals. Hollow-core fiber (HCF), with its intrinsically low optical nonlinearity, offers a promising solution. Here, we experimentally demonstrate the coexistence of polarization-entangled photons with dense wavelength-division multiplexed (DWDM) classical signals with a total launch power of 11.2 dBm, and perform a direct comparison between equal-length single-mode fiber (SMF) and photonic-bandgap-based HCF deployed in a campus network. We observe that HCF suppresses background noise by approximately two orders of magnitude compared to SMF, while preserving high-fidelity entanglement distribution. Our results provide clear experimental evidence of the advantage of HCF and establish its potential as a transmission medium.
Related
- A theoretical study of subcarrier-wave quantum key distribution system integration with an optical transport network utilizing dense wavelength division multiplexing
- Shift-register synchronization of dual-wavelength pulse trains in resonators with quadratic nonlinearity
- Exponential Entanglement Advantage in Sensing Correlated Noise
- No advantage from classical assistance for energy-constrained bosonic dephasing channels
- Quantum-Fisher-information-aware optimization yields a quantum reservoir advantage over tuned classical reservoirs
BibTeX
@misc{shimizu2026lownonlinearity,
title = {{Low-nonlinearity advantage of hollow-core fiber for wavelength multiplexing of quantum entanglement and classical DWDM signals}},
author = {Hikaru Shimizu and Arisa Ohno and Mao Miyasugi and Yumeno Seki and Naoyuki Funaoka and Yukari Takada and Aruto Hosaka and Shun Fujii and Hiroyuki Tsuda and Masahiro Takeoka},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.27540},
eprint = {2610.27540},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.27540},
}
RIS
TY - UNPB
TI - Low-nonlinearity advantage of hollow-core fiber for wavelength multiplexing of quantum entanglement and classical DWDM signals
AU - Hikaru Shimizu
AU - Arisa Ohno
AU - Mao Miyasugi
AU - Yumeno Seki
AU - Naoyuki Funaoka
AU - Yukari Takada
AU - Aruto Hosaka
AU - Shun Fujii
AU - Hiroyuki Tsuda
AU - Masahiro Takeoka
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.27540
UR - https://arxiv.org/abs/2610.27540
AB - Coexistence of classical and quantum light in optical fiber is a key requirement for scalable quantum networks. However, it is fundamentally limited by nonlinear crosstalk from intense classical signals. Hollow-core fiber (HCF), with its intrinsically low optical nonlinearity, offers a promising solution. Here, we experimentally demonstrate the coexistence of polarization-entangled photons with dense wavelength-division multiplexed (DWDM) classical signals with a total launch power of 11.2 dBm, and perform a direct comparison between equal-length single-mode fiber (SMF) and photonic-bandgap-based HCF deployed in a campus network. We observe that HCF suppresses background noise by approximately two orders of magnitude compared to SMF, while preserving high-fidelity entanglement distribution. Our results provide clear experimental evidence of the advantage of HCF and establish its potential as a transmission medium.
ER -