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Nonmaximally Entangled States can be Better for Quantum Correlation Distribution and Storage

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Abstract

For carrying out many quantum information protocols entanglement must be established in advance between two distant parties. Practically, inevitable interaction of entangled subsystems with their environments during distribution and storage will result in degradation of entanglement. Here we show that some partially entangled states are more robust than maximally entangled states in terms of the residual quantum correlation measured by concurrence, fully entangled fraction, and quantum discord, respectively. This phenomenon leads to the fact that nonmaximally entangled states can outperform maximally entangled states for quantum correlation distribution and storage under the amplitude damping. These results can also educe a noticeable consequence that the ordering of states under quantum correlation monotones can be reversed even by local trace-preserving and completely positive maps.

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Acknowledgements

This work was supported by the NSFC (No. 11004050 and No. 11375060), the China Postdoctoral Science Foundation funded project (No. 2013T60769), and the Hunan Provincial Applied Basic Research Base of Optoelectronic Information Technology (No. GDXX007).

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Authors and Affiliations

  1. Department of Physics and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, 410081, People’s Republic of China

    Xin-Wen Wang, Shi-Qing Tang, Ji-Bing Yuan & Le-Man Kuang

  2. Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang, 421002, People’s Republic of China

    Xin-Wen Wang

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  1. Xin-Wen Wang
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  2. Shi-Qing Tang
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  3. Ji-Bing Yuan
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Correspondence to Xin-Wen Wang.

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Wang, XW., Tang, SQ., Yuan, JB. et al. Nonmaximally Entangled States can be Better for Quantum Correlation Distribution and Storage. Int J Theor Phys 54, 1461–1469 (2015). https://doi.org/10.1007/s10773-014-2343-y

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  • DOI: https://doi.org/10.1007/s10773-014-2343-y

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