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We present a(t,n)threshold multiparty controlled quantum teleportation protocol of an arbitrary m-qubitquantum state between two remote parties.The unknown m-qubit quantum state can be recovered by the receiver undercontrol of a subset of the n controllers if the number of the subset is larger than or equal to a threshold,say,t,but not forany t —1 or fewer controllers.Our scheme seems to be more practical and more flexible than other existing protocols.Thequantum resource required is just m Einstein-Podolsky-Rosen(EPR)pairs plus some single photons.The techniquesrequired are only Bell state measurement,single-qubit unitary operation and von Neumann measurement.So our schemeis also feasible with present-day technique.
We present a (t, n) threshold multiparty controlled quantum teleportation protocol of an arbitrary m-qubitquantum state between two remote parties. Unknown m-qubit quantum state can be recovered by the receiver under control of a subset of the n controllers if the number of the subset is larger than or equal to a threshold, say, t, but not forany t -1 or fewer controllers. Our scheme seems to be more practical and more flexible than other existing protocols. The resource resource required is just m Einstein-Podolsky -Rosen (EPR) pairs plus some single photons. The techniques arequired to only Bell state measurement, single-qubit unitary operation and von Neumann measurement. S our schemeis also feasible with present-day technique.