Bound state in the continuum and multiple atom state transfer applications in a waveguide QED setup

• URL: http://arxiv.org/abs/2512.06365v1
• Date: Sat, 06 Dec 2025 09:36:54 GMT
• Title: Bound state in the continuum and multiple atom state transfer applications in a waveguide QED setup
• Authors: Xiang Guo, Xiaojun Zhang, Mingzhu Weng, Qian Bin, Hao-di Liu, Hai-Jun Xing, Xin-You Lü, Zhihai Wang,
• Abstract summary: Bound states in the continuum (BICs) have been extensively exploited to enhance light--matter interactions in metamaterials.<n>Our results establish BICs as long-lived resources for high-fidelity quantum information processing in waveguide-QED architectures.
• Score: 9.377099890467344
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Bound states in the continuum (BICs) have been extensively exploited to enhance light--matter interactions in metamaterials, yet their emergence and utility in multi-atom waveguide platforms remain far less explored. Here we study atom--waveguide-dressed BICs in a one-dimensional coupled-resonator waveguide, where two spatially separated atomic arrays couple to distinct resonators with time-dependent strengths. We show that these BICs support a standing-wave photonic mode and enable the transfer of an arbitrary unknown quantum state between the two arrays with fidelities exceeding $99\%$. The protocol remains robust against both disorder and intrinsic dissipation. Our results establish BICs as long-lived resources for high-fidelity quantum information processing in waveguide-QED architectures.

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