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Three-Party Quantum State Sharing of an Arbitrary Unknown Two-Qubit State Based on Entanglement Swapping and Bell-State Measurements
Authors:YUAN Hao  SONG Jun  HOU Kui  HU Xiao-Yuan  HAN Lian-Fang  SHI Shou-Hua
Affiliation:1.Department of Mathematics & Physics, West Anhui University, Lu'an 237012, China;2.School of Physics & Material Science, Anhui University, Hefei 230039, China;3.Teaching & Research Section of Physics, School of Basic Medical Science, Anhui Medical University, Hefei 230032, China
Abstract:We propose a scheme for sharing an arbitrary unknown two-qubit state among three parties by using a four-qubit cluster-class state and a Bell state as a quantum channel. With a quantum controlled phase gate (QCPG) operation and a local unitaryoperation, any one of the two agents has the access to reconstruct the original state if he/she collaborates with the other one, whilst individual agent obtains no information. As all quantum resource can be used to carry the useful information, the intrinsic efficiency of qubits approaches the maximal value. Moreover, the present scheme is more feasible with present-day technique.
Keywords:quantum state sharing   entanglement swapping   Bell-state measurements  QCPG operation   local unitary operation  
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