Narrowband Frequency-Entangled Photon Source for Hong-Ou-Mandel Interferometry

• URL: http://arxiv.org/abs/2512.19129v1
• Date: Mon, 22 Dec 2025 08:20:23 GMT
• Title: Narrowband Frequency-Entangled Photon Source for Hong-Ou-Mandel Interferometry
• Authors: Yen-Ju Chen, Sheng-Hsuan Huang, Thomas Dirmeier, Kaisa Laiho, Dmitry V. Strekalov, Andrea Aiello, Gerd Leuchs, Christoph Marquardt,
• Abstract summary: Hong-Ou-Mandel (HOM) interferometry with entangled photons exhibits distinctive quantum features.<n>We demonstrate narrowband frequency-entangled photon source based on resonant PDC in a crystalline whispering gallery mode resonator.
• Score: 1.4334192370121652
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Hong-Ou-Mandel (HOM) interferometry with entangled photons exhibits distinctive quantum features. By introducing frequency entanglement (discrete-color entangled states) into HOM interference, the characteristic HOM dip is modulated by sinusoidal fringes, which significantly enhance the sensitivity of HOM sensors. The frequency-entangled photon sources demonstrated to date rely on non-resonant parametric down-conversion (PDC), which limits the photon coherence length and, consequently, restricts the sensing dynamic range to the sub-millimeter scale. In this work, we demonstrate narrowband frequency-entangled photon source based on resonant PDC in a crystalline whispering gallery mode resonator. The MHz-level spectral bandwidth of photons enables a meter-scale dynamic range. With highly nondegenerate frequency-entangled photon pairs featuring a 96 THz frequency detuning, we observe high-contrast quantum beating with sub-picosecond resolution in the HOM experiment. Our WGMR-based frequency-entangled photon source has potential applications in quantum metrology and quantum information processing.

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