Quantum state preparation and transfer based on the bound state in the doublon continuum

• URL: http://arxiv.org/abs/2512.01339v1
• Date: Mon, 01 Dec 2025 06:55:33 GMT
• Title: Quantum state preparation and transfer based on the bound state in the doublon continuum
• Authors: Xiaojun Zhang, Xiang Guo, Yan Zhang, Xin Wang, Zhihai Wang,
• Abstract summary: Bound states in the continuum (BICs) have attracted intense interest, yet their many-particle counterparts remain largely unexplored in waveguide quantum electrodynamics.<n>We identify and characterize a bound state embedded in the doublon continuum (BIDC) that emerges when four atoms couple to a coupled-resonator waveguide with strong on-site interaction.<n>Exploiting this interaction-enabled BIDC, we show that (i) a distant, four-atom entangled state can be prepared with high fidelity, and (ii) quantum entangled states can be coherently transferred between spatially separated nodes.
• Score: 15.213818251457944
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Bound states in the continuum (BICs) have attracted intense interest, yet their many-particle counterparts remain largely unexplored in waveguide quantum electrodynamics. We identify and characterize a bound state embedded in the doublon continuum (BIDC) that emerges when four atoms couple to a coupled-resonator waveguide with strong on-site interaction. Exploiting this interaction-enabled BIDC, we show that (i) a distant, four-atom entangled state can be prepared with high fidelity, and (ii) quantum entangled states can be coherently transferred between spatially separated nodes. Our results establish a scalable mechanism for multi-particle state generation and routing in waveguide platforms, opening a route to interaction-protected quantum communication with many-particle BICs.

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