Abstract
By far the most efficient source of two-particle entangled state is spontaneous parametric down-conversion (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 [1]. 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.
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Y.-H. Kim, S.P. Kulik, and Y.H. Shih, Phys. Rev. A 62, 011802(R) (2000).
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Kim, YH., 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: Bigelow, N.P., Eberly, J.H., Stroud, C.R., Walmsley, I.A. (eds) Coherence and Quantum Optics VIII. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8907-9_139
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DOI: https://doi.org/10.1007/978-1-4419-8907-9_139
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