Abstract
An efficient multiparty quantum secret sharing scheme is proposedwith Greenberger–Horne–Zeilinger (GHZ) states following some ideasin quantum dense coding. The agents take the single-photonmeasurements on the photons received for eavesdropping check andexploit the four local unitary operations I, σz,σx and iσy to code their message. This scheme hasthe advantage of high capacity as each GHZ state can carry twobits of information. The parties do not need to announce themeasuring bases for almost all the photons, which will reduce theclassical information exchanged largely. The intrinsic efficiencyfor qubits and the total efficiency both approach the maximalvalues.
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