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Observation of Hong-Ou-Mandel interference between photon and polariton

Yun-Ru Fan Yingfei Su Kai Guo Bo-Yu Fan Yao-Qing Zhang Hai-Zhi Song Hao Li Yong Geng Kun Chen Deng-Ke Zhang Li-Xing You Yan-Yu Wei Guang-Can Guo Qiang Zhou

Sep 2026 · 0 citations · 36 references

Physics

Abstract

Light-matter interactions underlie many quantum technologies, yet whether quasiparticles formed from such interactions preserve the full quantum state of light remains unresolved. Surface plasmon polaritons (SPPs), a class of polaritons formed by interacting photons with free-electron oscillations at metal-dielectric interfaces, are prime candidates to explore this question. Here we demonstrate quantum interference between single photons and SPPs using an Au-SiN$_{\mathrm{x}}$ integrated photonic-plasmonic device. Our results reveal that SPPs retain the indistinguishability of their excitation photons, establishing SPP as a viable quantum information carrier and opening a potential route toward photonic-plasmonic quantum circuitry.

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