Yoon-Ho Kim, W. Grice, S. Kulik, M. Chekhova, Y. Shih
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Efficient extraction of polarization-entanglement in ultrafast type-II SPDC
We report an entanglement extraction scheme in which polarization-entangled photons are generated in ultrafast type-II SPDC without the need for spectral filters. High-quality polarization entanglement is possible, regardless of pump pulse duration or crystal thickness.