Advantages of the coherent state compared with squeezed state in unidimensional continuous variable quantum key distribution

In this work, a comparison study between unidimensional (UD) coherent-state and UD squeezed-state protocols is performed in the continuous variable quantum key distribution domain. First, a UD squeezed-state protocol is proposed, and the equivalence between the prepare-and-measure and entanglement-based schemes of UD squeezed-state protocol is proved. Then, the security of the UD squeezed-state protocol under collective attack in realistic conditions is analyzed. Finally, the performance of the two UD protocols is compared. Based on the uniform expressions established in our study, the squeezed- and coherent-state protocols can be analyzed simply by varying the squeezing parameter.

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