Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State |
| |
作者姓名: | TONGZhao-Yang KUANGLe-Man |
| |
作者单位: | DepartmentofPhysics,HunanNormalUniversity,Changsha410081,China |
| |
摘 要: | We study the degree to which quantum entanglement survives when a three-qubit entangled state is copied by using local and non-local processes,respectively,and investigate iterating quantum copying for the three-qubit system.There may exist inter-three-qubit entanglement and inter-two-qubit entanglement for the three-qubit system.We show that both local and non-local copying processes degrade quantum entanglement in the three-particle system due to a residual correlation between the copied output and the copying machine.we also show that the inter-two-qubit entanglement is preserved better than the inter-three-qubit entanglement in the local cloning process.We find that non-local cloning is much more efficient than the local copying for broadcasting entanglement,and output state via non-local cloning exhiits the fidelity better than local cloning.
|
关 键 词: | 信息光学 量子纠缠 量子复制 |
本文献已被 维普 等数据库收录! |
|