Beating The Beam Splitter Attack And Rayleigh Scattering Effect

We all known that in the practical Quantum Key Distribution (QKD) systems Eve could use beam splitter attack to get almost all of the secret information without being discovered by Bob and Alice. And Rayleigh scattering effect can give a contribution to Bit Error Rate (QBER) in the fiber channel. So in this paper, we modify two solutions for beating the beam splitter attack and Rayleigh scattering effect at the same time: Wavelength Division Multiplexing (WDM) and three-beam-splitter systems. And we compare these two solutions and use one of them in the appropriate situation. Eve can't catch anything about the secret information without increasing the QBER or decreasing the income at Bob side.