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We present an efficient and economic scheme for five-party quantum statesharing of an arbitrary m-qubit state with $2m$ three-particleGreenberger-Horne-Zeilinger (GHZ) states and three-particle GHZ-statemeasurements. It is more convenient than other schemes as it only resorts tothree-particle GHZ states and three-particle joint measurement, notfive-particle entanglements and five-particle joint measurements. Moreover,this symmetric scheme is in principle secure even though the number of thedishonest agents is more than one. Its total efficiency approaches the maximalvalue.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Efficient and economic five-party quantum state sharing of an arbitrary m-qubit state