Summary form only given. By far the most efficient source of two-particle entangled state is spontaneous parametric downconversion (SPDC). Especially, cw laser pumped type-II SPDC has been widely treated as a good source of entangled photon pairs, since one can easily prepare a polarization Bell state. However, femtosecond pulse pumped type-II SPDC shows poor quantum interference visibility when a thick crystal is used. To restore the visibility, one has to use narrow-band spectral filters at the expense of available photon flux. We demonstrate a scheme for high-visibility two-photon interference with thick (3.4 mm.) type-II BaB2O4 (BBO) crystals in femtosecond pulse pumped SPDC. Polarization Bell states can be prepared using this method without spectral and amplitude post-selection.
CITATION STYLE
Kim, Y.-H., Chekhova, M. V., Kulik, S. P., Rubin, M. H., & Shih, Y. (2003). High-visibility two-photon interference in femtosecond pulse pumped type-II SPDC. In Coherence and Quantum Optics VIII (pp. 503–504). Springer US. https://doi.org/10.1007/978-1-4419-8907-9_139
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