Abstract
A secure multiparty quantum key agreement protocol using single-qubit states is proposed. The agreement key is computed by performing exclusive-OR operation on all the participants’ secret keys. Based on the commutative property of the commutative encryption, the exclusive-OR operation can be performed on the plaintext in the encrypted state without decrypting it. Thus, it not only protects the final shared key, but also reduces the complexity of the computation. The efficiency of the proposed protocol, compared with previous multiparty QKA protocols, is also improved. In the presented protocol, entanglement states, joint measurement and even the unitary operations are not needed, and only rotation operations and single-state measurement are required, which are easier to be realized with current technology.
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Acknowledgments
The authors are grateful to the anonymous referees for their valuable comments and suggestions that help to improve the paper. This work is supported by the National Natural Science Foundation of China (No. 61402293, 61300204), Seed Funding from Scientific and Technical Innovation Council of Shenzhen Government (No. 827-000035), Natural Science Foundation of Guangdong (2015A030313630), Opening Project of Shanghai Key Laboratory of Integrated Administration Technologies for Information Security, the Science and Technology Innovation Projects of Shenzhen (Nos. JCYJ20150324141711665 and JCYJ20150324141711694), Natural Science Foundation of SZU (No. 201435), Shenzhen R&D Program (GJHZ20140418191518323) and Postdoctoral Science Foundation of China (No. 2015M572360).
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Sun, Z., Huang, J. & Wang, P. Efficient multiparty quantum key agreement protocol based on commutative encryption. Quantum Inf Process 15, 2101–2111 (2016). https://doi.org/10.1007/s11128-016-1253-8
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DOI: https://doi.org/10.1007/s11128-016-1253-8