Effects of dispersion on squeezing and photon statistics of down-converted light

Yuta Takahashi*, Jonas Söderholm, Keiichi Hirano, Naoto Namekata, Susumu Machida, Shigehiko Mori, Sunao Kurimura, Shinichi Komatsu, Shuichiro Inoue

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)


    The high peak intensity achieved with ultrashort pump pulses drastically increases the conversion efficiency in spontaneous parametric down-conversion. However, when ultrashort pulses are used, dispersion limits the degree of squeezing. Here, we investigate the effects of dispersion on both quadrature squeezing and photon statistics by varying the interaction length when pumping a periodically poled lithium niobate crystal with femtosecond pulses. The down-converted light in the 1550 nm telecom band attains its maximum observed squeezing level of 3.1 dB for the shortest interaction length. Our photon-statistics measurements agree with the photon-pair distribution going from thermal to Poissonian as the interaction length is increased. This is explained by considering the dispersion-induced distinguishability of the generated photon pairs.

    Original languageEnglish
    Article number043801
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number4
    Publication statusPublished - 2008 Apr 1

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Physics and Astronomy(all)


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