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The quantum key distribution for multiparty is one of the essential subjectsof study. Especially, without using entangled states, performing the quantumkey distribution for multiparty is a critical area of research. For thispurpose, sequential discrimination, which provides multiparty quantumcommunication and quantum key distribution for {multiple receivers}, hasrecently been introduced. However, since there is a possibility ofeavesdropping on the measurement result of a receiver by an intruder usingquantum entanglement, a security analysis for {quantum key distribution} shouldbe performed. {However,} no one has provided the security analysis for {quantumkey distribution in view of the sequential scheme} yet. In this work, byproposing a unified model of sequential discrimination including aneavesdropper, we provide the security analysis of {quantum key distributionbased on the unified model of sequential discrimination strategy.} In thismodel, the success probability of eavesdropping and the secret key rate can beused as a figure of merit. Then, we obtain a non-zero secret key rate betweenthe sender and receiver, which implies that the sender and receiver can share asecret key despite eavesdropping. Further, we propose a realistic quantumoptical experiment for the proposed model. We observe that the secret keybetween the sender and receiver can be non-zero, even with imperfections. Asopposed to common belief, we further observe that the success probability ofeavesdropping is smaller in the case of colored noise than in the case of whitenoise.

Complete security analysis of {quantum key distribution} based on unified model of sequential discrimination strategy