Bit Transmission Probability Maximizing the Key Rate of the BB84 Protocol

摘要

In all papers on the BB84 protocol, the transmission probability of each bit value is usually set to be equal. In this paper, we show that by assigning different transmission probability to each transmitted qubit within a single polarization basis, we can improve the key generation rate of the BB84 protocol and achieve a higher key rate over the amplitude damping channel. We determine the bit transmission probability that maximizes the key rate.