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arXiv · 2506.06123

A low-loss telecom-band nanofiber cavity for interfacing Yb atomic qubits

Seitaro Horikawa·Shinya Kato·Ryotaro Inoue·Takao Aoki·Akihisa Goban·Hideki Konishi
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Abstract

We demonstrate the fabrication of an optical nanofiber cavity designed for efficient interface with ytterbium (Yb) atoms at telecom-wavelength transitions. Replacing the conventional hydrogen-oxygen flame with a deuterium-oxygen flame in the heat-and-pull method suppresses hydroxyl-induced absorption losses and enables low-loss nanofiber production with minimal modifications to the existing fabrication system. Using this technique, we fabricate a nanofiber cavity at 1389 nm that exhibits an intrinsic round-trip loss of $0.31(2)\%$ and a finesse of $2.0(1)\times 10^{3}$. This performance corresponds to a projected cooperativity of 90 when interfaced with Yb atoms, indicating that the cavity is well suited for efficient atom-photon coupling at telecom wavelength transitions. Our results establish a practical route for developing fiber-integrated atom-photon interfaces in the telecom band, a critical step toward scalable quantum communication and distributed quantum computing.

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Seitaro Horikawa, Shinya Kato, Ryotaro Inoue, Takao Aoki, Akihisa Goban, Hideki Konishi. 2025-06-06. A low-loss telecom-band nanofiber cavity for interfacing Yb atomic qubits. https://arxiv.org/abs/2506.06123

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