Quantum plasmonic sensing by Hong-Ou-Mandel interferometry

• URL: http://arxiv.org/abs/2404.10994v3
• Date: Wed, 31 Jul 2024 03:07:08 GMT
• Title: Quantum plasmonic sensing by Hong-Ou-Mandel interferometry
• Authors: Seungjin Yoon, Yu Sung Choi, Mark Tame, Jae Woong Yoon, Sergey V. Polyakov, Changhyoup Lee,
• Abstract summary: A plasmonic beam splitter composed of a dual-Kretschmann configuration serves as a frustrated total internal reflection beamsplitter. We propose a quantum plasmonic sensor using Hong-Ou-Mandel (HOM) interferometry that measures the refractive index of an analyte.
• Score: 0.0879626117219674
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a quantum plasmonic sensor using Hong-Ou-Mandel (HOM) interferometry that measures the refractive index of an analyte, embedded in a plasmonic beam splitter composed of a dual-Kretschmann configuration, which serves as a frustrated total internal reflection beamsplitter. The sensing performance of the HOM interferometry, combined with single-photon detectors, is evaluated through Fisher information for estimation of the refractive index of the analyte. This is subsequently compared with the classical benchmark that considers the injection of a coherent state of light into the plasmonic beamsplitter. By varying the wavelength of the single photons and the refractive index of the analyte, we identify a wide range where a 50 % quantum enhancement is achieved and discuss the observed behaviors in comparison with the classical benchmark. We expect this study to provide a useful insight into the advancement of quantum-enhanced sensing technologies, with direct implications for a wide range of nanophotonic beamsplitter structures.

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