Implementing remotely a single-qubit rotation operation by three-qubit entanglement

• 来源期刊: 中国物理（英文版）
• 关键词: single-qubit rotation remote implementation GHZ class state W class state
• 年，卷（期）: 2005,（7）
• 页码范围: 1323-1328
• 页数: 6页
• 语种: 英文

摘要

We investigate the problem of quantum remote implementation of a single-qubit rotation operation using threequbit entangled state. Firstly, we utilize the entanglement property of maximally entangled Greenberger-HorneZeilinger (GHZ) state to design a theoretical scheme for implementing the operation remotely with unit fidelity and unit probability. Then, we put forward two schemes for conclusive implementing the non-local single-qubit rotation with unit fidelity by employing a partially entangled pure GHZ state as quantum channel. The features of these schemes are that a third side is included, who may participate the process of quantum remote implementation as a supervisor.Furthermore, when the quantum channel is partially entangled, the third side can rectify the state distorted by imperfect quantum channel. In addition to the GHZ class state, the W class state can also be used to remotely implement the same operation probabilistically. The probability of successful implementation using the W class state is always less than that using the GHZ class state.