Dispersion in Femtosecond Entangled Two-Photon Interference
  We theoretically investigate the quantum interference of entangled two-photon states generated in a nonlinear crystal pumped by femtosecond optical pulses. Interference patterns generated by the polarization analog of the Hong-Ou-Mandel interferometer are studied. Attention is devoted to the effects of the pump-pulse profile (pulse duration and chirp) and the second-order dispersion in both the nonlinear crystal and the interferometer's optical elements. Dispersion causes the interference pattern to have an asymmetric shape. Dispersion cancellation occurs in some cases. 
J. Perina, Jr., A. V. Sergienko, B. M. Jost, B. E. A. Saleh, M. C.   Teich (Boston University)