Generating spatially separated correlated multiphoton states in nonlinear waveguide quantum electrodynamics

• URL: http://arxiv.org/abs/2511.14281v1
• Date: Tue, 18 Nov 2025 09:16:12 GMT
• Title: Generating spatially separated correlated multiphoton states in nonlinear waveguide quantum electrodynamics
• Authors: Jia-Qi Li, Anton Frisk Kockum, Xin Wang,
• Abstract summary: We propose a scalable architecture for producing correlated few-photon entangled states via cascaded inelastic scattering.<n>The resulting output state forms a programmable superposition of spatially and temporally isolated photon-number components.<n>This work opens a new paradigm in quantum state engineering, enabling on-demand generation of complex multi-photon resources.
• Score: 7.847677608712246
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Strongly correlated multi-photon states are indispensable resources for advanced quantum technologies, yet their deterministic generation remains challenging due to the inherent weak nonlinearity in most optical systems. Here, we propose a scalable architecture for producing correlated few-photon entangled states via cascaded inelastic scattering in a nonlinear waveguide. When a single photon scatters off a far detuned excited two-level emitter, it coherently converts into a propagating doublon, a bound photon pair with anomalous dispersion. This doublon can subsequently scatter off a downstream excited emitter to further convert into a triplon, and so on, thereby establishing a photon-number amplification cascade $|\cdot \rangle \!\! \rightarrow \!\! |\!\!: \rangle \!\! \rightarrow \! \! |\!\!\therefore \rangle \!\! \to \!\! ...$ Central to this process is the concept of a pseudo-giant atom, which we introduce here to capture the non-local scattering potential emergent from the wave functions of bound states. By implementing this scheme using a real giant atom with multiple engineered coupling points, we achieve unidirectional and full controllable photon conversion without backscattering. The resulting output state forms a programmable superposition of spatially and temporally isolated photon-number components, automatically sorted by their distinct group velocities. This work opens a new paradigm in quantum state engineering, enabling on-demand generation of complex multi-photon resources for quantum simulation, metrology, and scalable quantum networks.

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