A Solution for Beam Splitter Attack on BB84 Protocol

In the practical Quantum Key Distribution (QKD) systems, the Fused Biconical Taper (FTP) technology beam splitter (BS) has wavelength dependent property. So Eve will get almost all of the secret information without being discovered in the beam splitter attack. This paper proposes a solution to solve the beam splitter attack. It uses three beam splitters to remove the incredible photons which could have been attacked by Eve. Bob gets a proper three-beam-splitter group, so Eve can't catch any secret information without being found. Index Terms - beam splitter, quantum key distribution (QKD), quantum bit error rate (QBER).