Structured Cavity Quantum Electrodynamics

• URL: http://arxiv.org/abs/2607.21012v1
• Date: Thu, 23 Jul 2026 07:49:37 GMT
• Title: Structured Cavity Quantum Electrodynamics
• Abstract summary: A cavity quantum electrodynamics system consists of a confined single photon and a single quantum emitter.<n>Here, we present the structured light-matter interaction at the single-photon level in a semiconductor cavity quantum electrodynamics system.
• Score: 8.558584026410477
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: A cavity quantum electrodynamics (cQED) system consisting of a confined single photon and a single quantum emitter serves as a fundamental block for quantum optics and photonic quantum technologies. The canonical optical mode employed in the conventional cavity quantum electrodynamics features a uniform polarization distribution, leading to the scalar light-matter interaction in most existing experiments. Despite the rapid progress in the generation of structured light with spatially varied polarizations, the structured light-matter interaction, especially at the single quanta level, is highly intriguing yet largely unexplored. Here, we present the structured light-matter interaction at the single-photon level in a semiconductor cavity quantum electrodynamics system. Four distinct structured cavity modes that are spectrally close to each other are constructed in a micropillar cavity. By spatially locating a single epitaxial quantum dot (QD) at the periphery of a semiconductor micropillar cavity and spectrally tuning the QD emission wavelength into the resonances of the structured cavity modes, cavity-enhanced single-photon emissions with spin-locked chiral orbital angular momentum (OAM) and engineerable spin-orbit entanglements are achieved within a single wavelength-scale device. Our work opens an unexplored paradigm of structured quantum light-matter interactions and may further advance chiral quantum optics and high-dimensional photonic quantum technology.

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