Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State

TONG Zhao-Yang ,KUANG Le-Man

理论物理通讯 ›› 2002, Vol. 38 ›› Issue (05) : 541-546.

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会计学季刊
Quarterly Journal of Accounting
主办单位:
香港中文大学会计学院
上海财经大学会计学院
南京大学商学院会计学系
ISSN: 3006-1415
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理论物理通讯 ›› 2002, Vol. 38 ›› Issue (05) : 541-546.

Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State

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Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State

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Abstract

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 exhibits the fidelity better than local cloning.

关键词

entangled states / quantum entanglement / quantum copying

Key words

entangled states / quantum entanglement / quantum copying

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TONG Zhao-Yang, KUANG Le-Man. Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State[J]. 理论物理通讯, 2002, 38(05): 541-546
TONG Zhao-Yang, KUANG Le-Man. Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State[J]. Communications in Theoretical Physics, 2002, 38(05): 541-546
中图分类号: 03.75.Fi    03.65.Bz    32.80.Pj   

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