Mid-infrared two-photon interference and polarization entanglement

Taylor Shields; Adetunmise Dada; Shashi Prabhakar; Mehdi Ebrahim; Gregor Taylor; Dmitry Morozov; Kleanthis Erotokritou; Shigehito Miki; Masahiro Yabuno; Hirotaka Terai; Corin Gawith; Robert H. Hadfield; Matteo Clerici; Lucia Caspani; Michael Kues

doi:10.1117/12.2588340

12 April 2021 Mid-infrared two-photon interference and polarization entanglement

Taylor Shields, Adetunmise Dada, Shashi Prabhakar, Mehdi Ebrahim, Gregor Taylor, Dmitry Morozov, Kleanthis Erotokritou, Shigehito Miki, Masahiro Yabuno, Hirotaka Terai, Corin Gawith, Robert H. Hadfield, Matteo Clerici, Lucia Caspani, Michael Kues

Author Affiliations +

Proceedings Volume 11721, Advanced Photon Counting Techniques XV; 117210N (2021) https://doi.org/10.1117/12.2588340
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Quantum-enhanced optical technologies operating within the 2- to 2.5-μm spectral region have the potential to revolutionize emerging applications in communications, sensing, and metrology. Currently, sources of entangled photons are available at visible, near-infrared and telecom wavelengths but are strongly underdeveloped at longer wavelengths. Here, using custom-designed lithium niobate crystals for spontaneous parametric down-conversion and tailored superconducting nanowire single-photon detectors, we demonstrate two-photon interference and polarization-entangled photon pairs at 2090 nm. These results open the 2- to 2.5-μm mid-infrared window for the development of optical quantum technologies such as quantum key distribution in next-generation mid-infrared fiber communication systems and future Earth-to-satellite communications.

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Taylor Shields, Adetunmise Dada, Shashi Prabhakar, Mehdi Ebrahim, Gregor Taylor, Dmitry Morozov, Kleanthis Erotokritou, Shigehito Miki, Masahiro Yabuno, Hirotaka Terai, Corin Gawith, Robert H. Hadfield, Matteo Clerici, Lucia Caspani, and Michael Kues "Mid-infrared two-photon interference and polarization entanglement", Proc. SPIE 11721, Advanced Photon Counting Techniques XV, 117210N (12 April 2021); https://doi.org/10.1117/12.2588340

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