Fano interference of photon pairs from a metasurface
Noh J, Santiago-Cruz T, Doiron CF, Jung H, Yu J, Addamane SJ, Chekhova MV, Brener I (2025)
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 14
Article Number: 371
Journal Issue: 1
DOI: 10.1038/s41377-025-01998-5
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 the generation and engineering of quantum light, in particular pairs of entangled photons (biphotons) via spontaneous parametric down-conversion (SPDC). Due to the relaxation of the phase-matching condition, 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 an 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 a linear polarizer, 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 spectrum of biphotons. 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 of photonic quantum technologies. (Figure presented.)
Authors with CRIS profile
Involved external institutions
Sandia National Laboratories
United States (USA) (US)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
United States (USA) (US)
Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Germany (DE)
How to cite
APA:
Noh, J., Santiago-Cruz, T., Doiron, C.F., Jung, H., Yu, J., Addamane, S.J.,... Brener, I. (2025). Fano interference of photon pairs from a metasurface. Light: Science & Applications, 14(1). https://doi.org/10.1038/s41377-025-01998-5
MLA:
Noh, Jiho, et al. "Fano interference of photon pairs from a metasurface." Light: Science & Applications 14.1 (2025).
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