Year: 2026
Type: article
Abstract: The generation of nonclassical light with strong photon antibunching and appreciable brightness remains an important goal in quantum technologies. Here, we demonstrate that cavity-mediated spin-exchange interactions provide a route to overcome this constraint by amplifying spectral anharmonicity. In a two-emitter cavity-QED system with a controllable relative phase φ , the resulting interference-interaction mechanism reshapes the dressed-state manifold and enables switching between distinct quantum emission regimes. For φ = 0, constructive interference yields highquality single-photon emission with near-perfect antibunching, suppressing g 1 (2) (0) by more than three orders of magnitude while maintaining a substantial intracavity photon population. Conversely, for φ = π , destructive interference suppresses direct single-photon excitation and selectively enhances two-photon excitation, producing signatures of correlated two-photon emission with appreciable intracavity photon populations and suppressed higher-order excitations. Our work establishes interference-engineered interactions as a mechanism for the controllable selection of single-photon and photon-pair emission, opening new opportunities for programmable nonclassical light sources and quantum photonic applications.
Source: Chinese Physics Letters
Authors: Jing Tang, Yuangang Deng
Institutions: Guangdong University of Technology, Sun Yat-sen University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7224449813