Stochastic decoherence induced by polarization mode dispersion

We address the propagation of entanglement in fibers and investigate decoherence polarization-entangled photon pairs caused by polarization mode dispersion (PMD). devise a model starting from statistical properties obtain density matrix describing initially maximally entangled states at any time. Using these results, we derive how depends on length fibers. calculate mean concurrence with PMD effects as function fiber length, bandwidth, other parameters different cases.