This work demonstrates the on-demand storage and retrieval of single photons from an InGaAs quantum dot (QD) in a cesium vapor memory. A key challenge was optimizing the interface between the solid-state single-photon source and the atomic system. The team used JCMsuite's finite element method to numerically design and optimize a hybrid circular Bragg grating cavity, which enhanced the QD's photon extraction efficiency and far-field profile for efficient coupling to the memory.
B. Maaß, et al. Storage of single photons from a semiconductor quantum dot in a room-temperature atomic vapor memory with on-demand retrieval. Quantum Sci. Technol. 10, 035058 (2025).