Physical implementation for entanglement purification of Gaussian continuous-variable quantum states - art. no. 032304

We give a detailed description of the entanglement purification protocol wh ich generates maximally en tangled states with high efficiencies from reali stic Gaussian continuous variable entangled states. The physical implementa tion of this protocol is extensively analyzed using high finesse cavities a nd cavity enhanced cross Kerr nonlinearities. In particular, we take into a ccount many imperfections in the experimental scheme and calculate their in fluences. Quantitative requirements are given for the relevant experimental parameters.