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Abstract:
Tapered nanofibers provide a distinctive platform for exploring the interactions between atoms and guided-mode photons, enabling the observation of novel quantum optical phenomena such as superradiance, subradiance, squeezing, and chiral photon transport. By integrating nanofibers with high-finesse fiber Bragg-grating cavities, we have demonstrated strong atom-photon coupling [1], achieving a projected single-atom cooperativity exceeding 100 with our enhanced design [2]. These nanofibers offer high controllability, a compact spatial profile, substantial atom capacity, and seamless integration with fiber networks, making them a promising candidate for scalable quantum networking devices.

In this talk, we will discuss our research efforts to combine nanofiber cavities with arrays of tweezer-trapped Yb atoms to achieve time and channel-multiplexed remote entanglement generation at telecom wavelengths [3]. Furthermore, we will introduce our recent analytical framework that quantifies photon-recoil-induced infidelity in remote-entanglement protocols, highlighting the bad-cavity regime and near-ground-state cooling as essential conditions for achieving sub-percent error rates in scalable quantum networks. Finally, we will outline our ongoing architectural design for bridging physical-level cavity operations to a logical qubit platform.

[1] S. Kato and T. Aoki, Phys. Rev. Lett. 115, 093603 (2015).
[2] S. K. Ruddell et al., Opt. Lett. 45, 4875 (2020).
[3] S. Sunami et al., PRX Quantum 6, 010101 (2025).
[4] S. Kikura et al., arXiv:2502.14859 (2025).