Preserving Entanglement of Flying Qubits in Optical Fibers by Dynamical   Decoupling
  We theoretically investigate the influence of dynamical decoupling sequence in preserving entanglement of polarized photons in polarization-maintaining birefringent fibers(PMF) under a classic Gauss 1/f noise. We study the dynamic evolution of entanglement along the control sequence embedded fibers. Decoherence due to dispersion of polarization mode in PMF can be dramatically depressed, even for a wild optical width. Entanglement degree can be effectively preserved while the control pulse is implemented. 
Bin Yan, Chuan-Feng Li and Guang-Can Guo
quant-ph