Controlled quantum secret sharing

We present a new protocol in which a secret multiqubit quantum state |Ψ is shared by n players and m controllers, where |Ψ is the encoding state of a quantum secret sharing scheme. The players may be considered as field agents responsible for carrying out a task, using the secret information encrypted in |Ψ, while the controllers are superiors who decide if and when the task should be carried out and who to do it. Our protocol only requires ancillary Bell states and Bell-basis measurements.

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