Deterministic multiphoton bundle emission via interference-interaction control

Quantum Physics [Submitted on 17 Apr 2026] Deterministic multiphoton bundle emission via interference-interaction control Jing Tang, Yuangang Deng The controlled generation of nonclassical light beyond single photons remains a central challenge in quantum optics, due to the difficulty of enhancing multiphoton processes while suppressing lower-order excitations. Here we propose an interference-interaction-engineered scheme for programmable few-photon emission in a cavity-QED system of three atoms coupled to orthogonal cavity modes. By adiabatically eliminating an auxiliary Fabry-Pérot cavity, we generate a tunable cavity-mediated spin-exchange interaction \chi, which, combined with a controllable geometric phase \phi, reshapes the many-body dressed-state spectrum. This interplay enables selective addressing of excitation manifolds (N=1,2,3), establishing a direct mapping between excitation structure and photon-emission channels. For \phi=0, constructive interference enhances the spectral anharmonicity of low-excitation manifolds, yielding tunable single- and two-photon emission associated with the N=1 and N=2 manifolds. In contrast, for \phi=2\pi/3, destructive interference suppresses lower-order excitation pathways and activates a resonant three-photon channel originating from the N=3 manifold. Importantly, the cavity-mediated interaction \chi further enhances spectral separation between manifolds, enabling a substantial improvement in multiphoton purity while maintaining a sizable photon population. We demonstrate a three-order-of-magnitude enhancement in two-photon purity and more than two orders of magnitude improvement in three-photon emission. Our results establish a unified interference-interaction framework in which effective optical nonlinearities can be programmably engineered through phase and interaction, providing a scalable route toward high-purity multiphoton sources and programmable quantum photonic devices. Comments: 13 pages, 5 figures Subjects: Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas) Cite as: arXiv:2604.15605 [quant-ph]   (or arXiv:2604.15605v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2604.15605 Focus to learn more Submission history From: Yuangang Deng [view email] [v1] Fri, 17 Apr 2026 01:08:50 UTC (6,354 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-04 Change to browse by: cond-mat cond-mat.quant-gas References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)