Abstract
A novel high-capacity protocol for deterministic secure quantum communication with four-qubit symmetric W state is proposed. In the presented protocol, the secret messages can be encoded on the four-qubit symmetric W states by employing four two-particle unitary operations and directly decoded by utilizing the corresponding measurements in Bell basis or single particle basis. It has a high capacity as each W state can carry two bits of secret information, and has a high intrinsic efficiency because almost all the instances are useful. The security of this communication can be ensured by the decoy photon checking technique and the order rearrangement of particle pairs technique. Furthermore, this protocol is feasible with present-day technique.
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This work is supported by the Key Project of the Education Department of Anhui Province under Grant No. KJ2010A323, the Talent Project of the Anhui Province for Outstanding Youth under Grant Nos. 2009SQRZ190, 2010SQRL186, 2010SQRL187 and 2011SQRL147, the Natural Science Research Programme of the Education Department of Anhui Province under Grant No. KJ2009B018Z.
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Yuan, H., Song, J., Zhou, J. et al. High-capacity Deterministic Secure Four-qubit W State Protocol for Quantum Communication Based on Order Rearrangement of Particle Pairs. Int J Theor Phys 50, 2403–2409 (2011). https://doi.org/10.1007/s10773-011-0729-7
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DOI: https://doi.org/10.1007/s10773-011-0729-7