18 August 2005 Quantum interference by femtosecond multi-photon absorption in conjugated dendrimers
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We demonstrate high contrast interference fringes when near-IR frequencies and UV frequency 3ω excite fluorescence via two alternative but in practice indistinguishable quantum pathways. We use specially synthesized organic dendrimers with an exceptionally large three-photon cross section, σ3=1.5 10-79 cm6 s2 based on bisdiphenylamino stilbene core and bis-diphenylamino di-styryl benzene repeat units. We show for the first time that quantum interference signal can be strong enough for being observed with an unaided eye.
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Aleksander Rebane, Niklas Christensson, Mikhail Drobizhev, Yuriy Stepanenko, Charles W. Spangler, "Quantum interference by femtosecond multi-photon absorption in conjugated dendrimers", Proc. SPIE 5934, Nonlinear Optical Transmission and Multiphoton Processes in Organics III, 59340L (18 August 2005); doi: 10.1117/12.617308; https://doi.org/10.1117/12.617308

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