A Comparative Study of Lm05 and Ping Pong Protocols under Amplitude Damping Noisy Channel
QSDC is a new branch of quantum communication, which aims to transmit the secret message directly without first generating a key to encrypt it. Many protocols have been proposed in it and their transmission efficiency also has been studied. The effect of noise on various protocols of secure quantum communication has been studied under different noise models. In ideal situation, when noiseless quantum channel is used, the quantum states of the transmitted system leaves intact. However, in practical situation the quantum states interact with environment leads to decoherence. It is also observed that the effect of noise entirely depends upon the number of rounds of quantum communication involved in a scheme of quantum communication. Here, specifically the effect of amplitude damping (AD) noise model have been compared between two QSDC protocols, i.e. LM05 and Ping Pong protocol. From the comparative study of both, it has been revealed that single-qubit-based schemes are generally found to perform better in the presence of amplitude damping than the entanglement-based schemes.