dorsal/arxiv
View SchemaRobust and fragile Werner states in the collective dephasing
| Authors | Shang-Bin Li, Jing-Bo Xu |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0503143 |
| URL | https://arxiv.org/abs/quant-ph/0503143 |
| DOI | 10.1140/epjd/e2006-00216-x |
| Journal | EUROPEAN PHYSICAL JOURNAL D 41, 377 (2007) |
Abstract
We investigate the concurrence and Bell violation of the standard Werner state or Werner-like states in the presence of collective dephasing. It is shown that the standard Werner state and certain kinds of Werner-like states are robust against the collective dephasing, and some kinds of Werner-like states is fragile and becomes completely disentangled in a finite-time. The threshold time of complete disentanglement of the fragile Werner-like states is given. The influence of external driving field on the finite-time disentanglement of the standard Werner state or Werner-like states is discussed. Furthermore, we present a simple method to control the stationary state entanglement and Bell violation of two qubits. Finally, we show that the theoretical calculations of fidelity based on the initial Werner state assumption well agree with previous experimental results.
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"abstract": "We investigate the concurrence and Bell violation of the standard Werner\nstate or Werner-like states in the presence of collective dephasing. It is\nshown that the standard Werner state and certain kinds of Werner-like states\nare robust against the collective dephasing, and some kinds of Werner-like\nstates is fragile and becomes completely disentangled in a finite-time. The\nthreshold time of complete disentanglement of the fragile Werner-like states is\ngiven. The influence of external driving field on the finite-time\ndisentanglement of the standard Werner state or Werner-like states is\ndiscussed. Furthermore, we present a simple method to control the stationary\nstate entanglement and Bell violation of two qubits. Finally, we show that the\ntheoretical calculations of fidelity based on the initial Werner state\nassumption well agree with previous experimental results.",
"arxiv_id": "quant-ph/0503143",
"authors": [
"Shang-Bin Li",
"Jing-Bo Xu"
],
"categories": [
"quant-ph"
],
"doi": "10.1140/epjd/e2006-00216-x",
"journal_ref": "EUROPEAN PHYSICAL JOURNAL D 41, 377 (2007)",
"title": "Robust and fragile Werner states in the collective dephasing",
"url": "https://arxiv.org/abs/quant-ph/0503143"
},
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