Two-photon quantum interference and entanglement at 2.1 μm

Quantum-enhanced optical systems operating within the 2- to 2.5-μm spectral region have the potential to revolutionize emerging applications in communications, sensing, and metrology. However, to date, sources of entangled photons have been realized mainly in the near-infrared 700- to 1550-nm spectr...

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Published inScience advances Vol. 6; no. 13; p. eaay5195
Main Authors Prabhakar, Shashi, Shields, Taylor, Dada, Adetunmise C, Ebrahim, Mehdi, Taylor, Gregor G, Morozov, Dmitry, Erotokritou, Kleanthis, Miki, Shigehito, Yabuno, Masahiro, Terai, Hirotaka, Gawith, Corin, Kues, Michael, Caspani, Lucia, Hadfield, Robert H, Clerici, Matteo
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 27.03.2020
Subjects
Optics
Physics
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Summary:Quantum-enhanced optical systems operating within the 2- to 2.5-μm spectral region have the potential to revolutionize emerging applications in communications, sensing, and metrology. However, to date, sources of entangled photons have been realized mainly in the near-infrared 700- to 1550-nm spectral window. 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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ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.aay5195