期刊
QUANTUM INFORMATION PROCESSING
卷 10, 期 2, 页码 231-239出版社
SPRINGER
DOI: 10.1007/s11128-010-0191-0
关键词
Quantum information; Quantum cryptography; Quantum secret sharing; Quantum state sharing
资金
- National Natural Science Foundation of China [90818005, 60903217, 60773032, 60773114]
- Ph.D. Program Foundation of Ministry of Education of China [20060358014]
We present a newscheme for sharing an arbitrary two-qubit quantum state with n agents. In our scheme, the sender Alice first shares n Einsein-Podolsky-Rosen (EPR) pairs in Bell states with n agents. After setting up the secure quantum channel, Alice first applies (n - 2) Controlled-Not (CNOT) gate operations, and then performs two Bell-state measurements and (n - 2) single-particle measurements (n > 2). In addition, all controllers only hold one particle in their hands, respectively, and thus they only need to perform a single-particle measurement on the respective particle with the basis {vertical bar 0 >, vertical bar 1 >}. Compared with other schemes with Bell states, our scheme needs less qubits as the quantum resources and exchanges less classical information, and thus obtains higher total efficiency.
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