Entanglement swapping of continuous variable using squeezed vacuum states

• 来源期刊: 中国物理（英文版）
• 关键词: entanglement swapping continuous variable squeezed vacuum states
• 年，卷（期）: 2007,（10）
• 页码范围: 2885-2888
• 页数: 4页
• 语种: 英文

摘要

We present a realistic scheme for the entanglement swapping of continuous variable, in which a two-mode squeezed vacuum state serves as a quantum channel. The position sum and momentum difference of two local modes are measured.By taking the input entangled state also as a two-mode squeezed vacuum state, we investigate the average fidelity and the von Neumann entropy of the output state. The results show that the perfect teleportation can be achieved by increasing the squeezing of the quantum channel and that any nonzero squeezing in both the quantum channel and the input entangled state is sufficient to swap the entanglement.