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

2025/12/06 by Guo, Xiang, Zhang, Xiaojun, Weng, Mingzhu +5
#FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2512.06365

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.

Citations

• Rabi oscillation and fractional population via the bound states in the continuum in a giant atom waveguide QED setup
• Chiral quantum optics: recent developments, and future directions
• Niobium coaxial cavities with internal quality factors exceeding 1.5 billion for circuit quantum electrodynamics
• High-Q trenched aluminum coplanar resonators with an ultrasonic edge microcutting for superconducting quantum devices
• Circuit Quantum Electrodynamics

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