Article

Quantum Information Processing

, Volume 10, Issue 1, pp 97-106

Sharing a quantum secret without a trusted party

  • Qin LiAffiliated withDepartment of Computer Science, Sun Yat-sen UniversityDepartment of Mathematics, Hong Kong Baptist University Email author 
  • , Dong Yang LongAffiliated withDepartment of Computer Science, Sun Yat-sen University
  • , W. H. ChanAffiliated withDepartment of Mathematics, Hong Kong Baptist University
  • , Dao Wen QiuAffiliated withDepartment of Computer Science, Sun Yat-sen University

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Abstract

In a conventional quantum (k, n) threshold scheme, a trusted party shares a secret quantum state with n participants such that any k of those participants can cooperate to recover the original secret, while fewer than k participants obtain no information about the secret. In this paper we show how to construct a quantum (k, n) threshold scheme without the assistance of a trusted party, who generates and distributes shares among the participants. Instead, each participant chooses his private state and contributes the same to the determination of the final secret quantum state.

Keywords

Quantum secret sharing Quantum cryptography Quantum information processing Quantum communication