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Attosecond entangled photons from two-photon decay of metastable atoms: A source for attosecond experiments and beyond

Yimeng Wang1,*, Siddhant Pandey1, Chris H. Greene1,2, and Niranjan Shivaram1,2,†

  • 1Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
  • 2Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, Indiana 47907, USA

  • *wang3607@purdue.edu
  • †niranjan@purdue.edu

Broadband femtosecond lasers enable efficient two-photon excitation of the ultranarrow linewidth singlet 1s2s state in helium

Shashank Kumar, Justin D. Piel, Chris H. Greene, and Niranjan Shivaram

Phys. Rev. Research 8 013009 (2026)

Tailoring directivity of two-photon spontaneous emission using plasmonic nanoantennas

Steve Smeets, Bjorn Maes, and Gilles Rosolen

Opt. Lett. 50 1845 (2025)

Outlook for active plasma spectroscopy with entangled two-photon absorption

David R Smith, Nivedan Vishwanath, Michael Zepp, Matthias Beuting, Daniel J Den Hartog, Benedikt Geiger, Scott T Sanders, Xuting Yang, and Jennifer T Choy

J. Phys. D: Appl. Phys. 58 505204 (2025)

Vacuum pair production in zeptosecond pulses: Peculiar momentum spectra and striking particle acceleration by bipolar pulses

I. A. Aleksandrov and N. N. Rosanov

Phys. Rev. D 110 L111901 (2024)

Kramers-Krönig approach to the electric permittivity of the vacuum in a strong constant electric field

Hidetoshi Taya and Charlie Ironside

Phys. Rev. D 108 096005 (2023)

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