Etsuki Kobiyama

Abstract Interactions between emitters can create cooperative effects that alter light emission. In superfluorescence (SF), excited dipoles couple coherently and radiate collectively, requiring low energetic disorder and strong temporal coherence. Conversely, amplified spontaneous emission results from stimulated amplification and does not require temporal coherence but, unlike SF, sufficient propagation for optical gain.

The generation of single photons lies at the heart of quantum technologies. From ultrasecure communication to quantum computing and precision sensing, on demand single-photon sources are essential building blocks. Around the world, researchers are in a race to develop reliable, on-demand single-photon emitters, pushing the boundaries of material science, nanotechnology, and photonic engineering to meet the growing demand of scalable quantum systems.

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