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

• URL: http://arxiv.org/abs/2609.02200v1
• Date: Wed, 02 Sep 2026 07:09:02 GMT
• Title: Observation of Hong-Ou-Mandel interference between photon and polariton
• Abstract summary: Surface plasmon polaritons (SPPs) formed by interacting photons with free-electron oscillations at metal-dielectric interfaces are prime candidates to explore this question.<n>We demonstrate quantum interference between single photons and SPPs using an Au-SiN$_mathrmx$ integrated photonic-plasmonic device.
• Score: 11.447388794359028
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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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