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      A continued fraction based approach for the Two-photon Quantum Rabi Model 

      Lupo, Elena; Napoli, Anna; Messina, Antonino; Solano Villanueva, Enrique Leónidas; Egusquiza Egusquiza, Iñigo Luis (Nature Publishing, 2019-03-11)
      We study the Two Photon Quantum Rabi Model by way of its spectral functions and survival probabilities. This approach allows numerical precision with large truncation numbers, and thus exploration of the spectral collapse. ...