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<p>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 <i>p</i>-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 <i>g</i><sup>(2)</sup>(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.</p>

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Purcell-enhanced two-photon emission from a quantum dot via dark-state biexciton loading

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Bang Wu,
  • Li Liu,
  • Hanqing Liu,
  • Xinrui Mao,
  • Xu-Jie Wang,
  • Haiqiao Ni,
  • Zhichuan Niu,
  • Zhiliang Yuan

摘要

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.