New Source of Ten-photon Entanglement from Thin BiB$_{3}$O$_{6}$ Crystals

We report an experimental generation of ten-photon Greenberger-Horne-Zeilinger state by employing thin BiB$_{3}$O$_{6}$ crystals which are efficient both for type-II spontaneous parametric down-conversion and for entangled photon collection. We witness genuine ten-photon entanglement with an observed fidelity of $bar F_{text{exp}}=0.606pm0.029$. Our results are further verified faithfully by calculating the $p$-value, which is upper bounded by $3.7times10^{-3}$ under a hypothesis test. Our experiment open a new way to efficiently engineer multi-photon entanglement based on thin BiB$_{3}$O$_{6}$ crystals, and provide a promising platform for investigations of advanced optical quantum information processing tasks such as boson sampling, quantum error correction and quantum-enhanced measurement.