Strong coupling of a reconfigurable ¹⁷¹Yb atom array to a tunable telecom-band nanofiber cavity

@misc{ozawa2026strong,
  title = {{Strong coupling of a reconfigurable $^171$Yb atom array to a tunable telecom-band nanofiber cavity}},
  author = {Hideki Ozawa and Neville Chen and Yusuke Hisai and Shunichiro Hashimoto and Kenichi N. Komagata and Remi T. Oddon and Shanjou Yang and Seitaro Horikawa and Seigo Kikura and Shigehito Miki and Takao Aoki and Tadayuki Yoshitake and Hideki Konishi and Shinichi Sunami and Akihisa Goban and Ryotaro Inoue},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.25232},
  eprint = {2609.25232},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.25232},
}

TY  - UNPB
TI  - Strong coupling of a reconfigurable ^171Yb atom array to a tunable telecom-band nanofiber cavity
AU  - Hideki Ozawa
AU  - Neville Chen
AU  - Yusuke Hisai
AU  - Shunichiro Hashimoto
AU  - Kenichi N. Komagata
AU  - Remi T. Oddon
AU  - Shanjou Yang
AU  - Seitaro Horikawa
AU  - Seigo Kikura
AU  - Shigehito Miki
AU  - Takao Aoki
AU  - Tadayuki Yoshitake
AU  - Hideki Konishi
AU  - Shinichi Sunami
AU  - Akihisa Goban
AU  - Ryotaro Inoue
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.25232
UR  - https://arxiv.org/abs/2609.25232
AB  - Nanophotonic cavities provide strong atom-photon coupling in a compact, directly fiber-coupled geometry, while a reconfigurable array of ^171Yb atoms combines high-fidelity gates with a metastable qubit state coupled directly to a telecom-band transition, making the two a natural interface between neutral-atom quantum processors and telecom quantum networks. Here, we realize strong atom-cavity coupling on the ^3P_0 ↔ ^3D_1 transition of ^171Yb, establishing, to our knowledge, the first neutral-atom cavity-QED system to reach the single-atom strong-coupling regime on a telecom-band atomic transition. Reflection spectroscopy of a single-sided cavity yields a single-atom internal cooperativity of C_in=5.6(1.0) and collective coupling following √N scaling up to N=5 atoms, with homogeneous coupling at antinodes over ∼200 μm along the nanofiber. Thermal tuning of a fiber Bragg grating provides in situ control of the cavity outcoupling rate over two orders of magnitude from the undercoupled to the overcoupled regime, relevant for various atom-cavity protocols. We confirm compatibility with reconfigurable atom arrays by demonstrating 99.95(6)\% imaging fidelity and trap lifetimes comparable to free-space array, at 1 μm from the nanofiber axis. Moreover, the diameter-engineered antireflection design of the nanofiber enables tweezer-based atom transport across the nanofiber with no measurable loss or heating at 4.5 μm above the nanofiber, supporting a two-layer architecture for the nanofiber-integrated atom array. From the demonstrated atom-cavity coupling, atom capacity, and cavity mode profile, we project time-multiplexed remote atom-atom entanglement generation at 40 kHz, with prospects for further scaling through technical enhancements and channel multiplexing.
ER  -