Abstract
Based on four-qubit cluster states, we present a two-party quantum key agreement (QKA) scheme using unitary operations. In this scheme, two participants perform the unitary operation on the different photon of the same cluster state, which guarantees that each party contributes equally to the agreement key. By measuring each cluster state and decoding, these two participants can generate a four-bit classical key without the exchange of classical bits between them. Compared with other existed two-party QKA protocols, our scheme is efficient. Security analysis shows that our protocol is secure against both participant and outsider attack.
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Acknowledgments
This work was supported by the National Science Foundation of China under Grant Nos. 61072140 and 61373171, the 111 Project under Grant No. B08038, and the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No. 20100203110003.
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Shen, DS., Ma, WP. & Wang, Ll. Two-party quantum key agreement with four-qubit cluster states. Quantum Inf Process 13, 2313–2324 (2014). https://doi.org/10.1007/s11128-014-0785-z
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DOI: https://doi.org/10.1007/s11128-014-0785-z