Solid‐State Quantum Emitters

This perspective gives a tutorial overview of the development of solid‐state quantum emitters over the past three decades, focusing on the key parameters that are used to assess their performance for applications in quantum photonics. Specifically, it covers single‐photon purity and indistinguishability, source brightness, and on‐demand operation. The perspective includes a brief comparison of different material systems and concludes with a discussion of challenges that remain to be solved.