Fano interference of photon pairs from a metasurface

Fano interference of photon pairs from a metasurface | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Fano interference of photon pairs from a metasurface Jiho Noh, Tomás Santiago-Cruz, Chloe Doiron, Hyunseung Jung, Jaeyeon Yu, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6173761/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 17 Oct, 2025 Read the published version in Light: Science & Applications → Version 1 posted 10 You are reading this latest preprint version Abstract Two-photon interference, a quantum phenomenon arising from the principle of indistinguishability, is a powerful tool for quantum state engineering and plays a fundamental role in various quantum technologies. These technologies demand robust and efficient sources of quantum light, as well as scalable, integrable, and multifunctional platforms. In this regard, quantum optical metasurfaces (QOMs) are emerging as promising platforms for quantum light generation, namely biphotons via spontaneous parametric down-conversion (SPDC), and its engineering. Due to the relaxation of phase matching, SPDC in QOMs allows different channels of biphoton generation, such as those supported by overlapping resonances, to occur simultaneously. In previously reported QOMs, however, SPDC was too weak to observe such effects. Here we develop QOMs based on [110]-oriented GaAs that provide order-of-magnitude enhancement in SPDC rate, after accounting for the spectral bandwidth, compared to any other QOMs studied to date. This boosted efficiency allows the QOMs to support the simultaneous generation of SPDC from several spectrally overlapping optical modes. Using polarization components in the interferometer analyzer, we intentionally erase the distinguishability between the biphotons from a high-$Q$ quasi-bound-state-in-the-continuum resonance and a low-$Q$ Mie resonance, which results in the first-time observation of two-photon interference, shown in the form of a Fano contour, in the spectral domain in these types of devices. This quantum interference can enrich the generation of entangled photons in metasurfaces. Their advanced multifunctionality, improved nonlinear response, ease of fabrication, and compact footprint of [110]-GaAs QOMs position them as promising platforms to fulfill the requirements for photonic quantum technologies. Physical sciences/Optics and photonics/Optical physics/Nonlinear optics Physical sciences/Optics and photonics/Optical physics/Quantum optics Physical sciences/Optics and photonics/Optical physics/Single photons and quantum effects Physical sciences/Optics and photonics/Optical physics/Nanophotonics and plasmonics Full Text Additional Declarations There is no conflict of interest Supplementary Files TwoPhotonInteferenceSupp.pdf Supplementary information: Fano interference of photon pairs from a metasurface Cite Share Download PDF Status: Published Journal Publication published 17 Oct, 2025 Read the published version in Light: Science & Applications → Version 1 posted Editorial decision: revise 08 Apr, 2025 Review # 1 received at journal 01 Apr, 2025 Review # 2 received at journal 29 Mar, 2025 Reviewer # 3 agreed at journal 20 Mar, 2025 Reviewer # 2 agreed at journal 13 Mar, 2025 Reviewer # 1 agreed at journal 13 Mar, 2025 Reviewers invited by journal 13 Mar, 2025 Submission checks completed at journal 12 Mar, 2025 Editor assigned by journal 06 Mar, 2025 First submitted to journal 06 Mar, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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