dorsal/arxiv
View SchemaEntanglement Preserving in Quantum Copying of Three-qubit Entangled State
| Authors | Zhao-Yang Tong, Le-Man Kuang |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0402074 |
| URL | https://arxiv.org/abs/quant-ph/0402074 |
| Journal | Commun. Theor. Phys. 38 (2002) 541-546 |
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.
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"abstract": "We study the degree to which quantum entanglement survives when a three-qubit\nentangled state is copied by using local and non-local processes, respectively,\nand investigate iterating quantum copying for the three-qubit system. There may\nexist inter-three-qubit entanglement and inter-two-qubit entanglement for the\nthree-qubit system. We show that both local and non-local copying processes\ndegrade quantum entanglement in the three-particle system due to a residual\ncorrelation between the copied output and the copying machine. We also show\nthat the inter-two-qubit entanglement is preserved better than the\ninter-three-qubit entanglement in the local cloning process. We find that\nnon-local cloning is much more efficient than the local copying for\nbroadcasting entanglement, and output state via non-local cloning exhibits the\nfidelity better than local cloning.",
"arxiv_id": "quant-ph/0402074",
"authors": [
"Zhao-Yang Tong",
"Le-Man Kuang"
],
"categories": [
"quant-ph"
],
"journal_ref": "Commun. Theor. Phys. 38 (2002) 541-546",
"title": "Entanglement Preserving in Quantum Copying of Three-qubit Entangled State",
"url": "https://arxiv.org/abs/quant-ph/0402074"
},
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