Entanglement Preserving in Quantum Copying of Three-Qubit Entangled State |
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Authors: | TONG Zhao-Yang KUANG Le-Man |
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Institution: | Department of Physics, Hunan Normal University, Changsha 410081, China Department of Physics, Hunan Normal University, Changsha 410081, China |
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Abstract: | We study the degree to which quantum entanglement survives when a three-qubit entangled state iscopied by using local and non-local processes, respectively, and investigate iterating quantum copyingfor the three-qubitsystem. 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 systemdue to a residual correlation between the copied output and the copying machine. We also show that the inter-two-qubitentanglement is preserved better than the inter-three-qubit entanglement in the local cloning process. We find thatnon-local cloning is much more efficient than the local copying for broadcasting entanglement, and output state vianon-local cloning exhibits the fidelity better than local cloning. |
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Keywords: | entangled states quantum entanglement quantum copying |
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