Purcell-enhanced two-photon emission from a quantum dot via dark-state biexciton loading
Source abstract
Abstract
Generating light in well-defined photon-number states is central to photonic quantum technologies. While deterministic single-photon sources are well established, producing efficient two-photon states from individual emitters remains challenging. Here we demonstrate a high-efficiency two-photon emitter using the degenerate biexciton-exciton cascade in a Purcell-enhanced quantum dot-micropillar system. Leveraging polarization-selective p-shell excitation, we achieve effective biexciton loading and identify stimulated emission as a key mechanism enhancing two-photon temporal correlation. The emitter exhibits a two-photon correlation of g(2)(0) = 3,966(324), with a two-photon fraction of 0.983(1), and operates in a hybrid, predominantly cascade-dominated regime where cavity-stimulated two-photon emission coexists with the conventional biexciton-exciton cascade. These findings represent progress towards developing practical, on-demand, solid-state two-photon sources.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Photonic Crystals and Applications · Semiconductor Quantum Structures and Devices · Photonic and Optical Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (49)
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