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QUANTUM KEY DISTRIBUTION WITH LIMITED CLASSICAL BOB

School of Information Science, and Technology Sun Yat-sen University, Guangzhou 510006, China

Center of Quantum Computation, and Intelligent Systems, Faculty of Information, Technology, University of Technology, Sydney, NSW 2007, Australia

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RUI-GANG DU

School of Information Science, and Technology Sun Yat-sen University, Guangzhou 510006, China

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DONG-YANG LONG

School of Information Science, and Technology Sun Yat-sen University, Guangzhou 510006, China

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https://doi.org/10.1142/S0219749913500056Cited by:38 (Source: Crossref)

Abstract

Recently, quantum key distribution (QKD) with classical Bob has been suggested and proven completely robust by Boyer et al. [Phys. Rev. Lett.99 (2007) 140501] in which quantum Alice has a fully-fledged quantum power, while classical Bob is restricted to preparing and measuring a particle in the computational basis, reflecting or reordering the particles. In this paper, we describe two related but simpler semi-quantum key distribution protocol that exempts classical Bob from measurement (hereafter called limited classical Bob for convenience) and, prove them completely robust. As limited classical Bob can deterministically prepare the qubits, we exploit this feature to construct a semi-quantum secure direct communication protocol, which is the direct communication of secret messages without first producing a shared secret key.

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