Nonmaximally Entangled States can be Better for Quantum Correlation Distribution and Storage
Nonmaximally Entangled States can be Better for Quantum Correlation Distribution and Storage
复制标题
非极大纠缠态更适合量子相关分布和存储
DOI：
10.1007/s10773-014-2343-y
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发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
L. M. Kuang
中科院分区：
文献类型：
--
作者：
X. W. Wang;S. Q. Tang;J. B. Yuan;L. M. Kuang
为了实现许多量子信息协议，必须在两个远程方之间预先建立纠缠。实际上，在分配和存储过程中，纠缠子系统与环境之间不可避免的相互作用将导致纠缠的退化。在此，我们证明了部分纠缠态比最大纠缠态在剩余量子相关（分别由并发、完全纠缠分数和量子不和谐测量）方面具有更强的鲁棒性。这一现象导致在振幅阻尼下，非最大纠缠态在量子相关分布和存储方面优于最大纠缠态。这些结果还可以得出一个显著的结论，即即使通过局部保迹和完全正映射也可以反转量子相关单调下的态的顺序。
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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