Abstract
We study the properties of three-frequency entangled light fields which can be produced at the quasiphase-matched-wave interactions in a single aperiodically-poled nonlinear crystal, including two parametric down-conversions and one parametric up-conversion. We derive the expression for the density operator for the case where the input field at one frequency is in the Fock state. We calculate the photon number correlations of the three-frequency fields and information characteristics.
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Chirkin, A.S., Saigin, M.Y. Statistic and information characterization of tripartite entangled states. J Russ Laser Res 28, 505–515 (2007). https://doi.org/10.1007/s10946-007-0038-z
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DOI: https://doi.org/10.1007/s10946-007-0038-z