Quantum correlations in Gaussian states via Gaussian channels: steering, entanglement, and discord

被引：6
|
作者：
Wang, Zhong-Xiao [1 ]
Wang, Shuhao [2 ,3 ]
Li, Qiting [4 ]
Wang, Tie-Jun [1 ]
Wang, Chuan [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, Sch Sci, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
[2] Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[4] Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R China
来源：
QUANTUM INFORMATION PROCESSING | 2016年 / 15卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Gaussian state; Gaussian channel; Quantum steering; Quantum entanglement; Quantum discord; SUDDEN-DEATH; SEPARABILITY;
D O I：
10.1007/s11128-016-1276-1
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Here we study the quantum steering, quantum entanglement, and quantum discord for Gaussian Einstein-Podolsky-Rosen states via Gaussian channels. And the sudden death phenomena for Gaussian steering and Gaussian entanglement are theoretically observed. We find that some Gaussian states have only one-way steering, which confirms the asymmetry of quantum steering. Also we investigate that the entangled Gaussian states without Gaussian steering and correlated Gaussian states own no Gaussian entanglement. Meanwhile, our results support the assumption that quantum entanglement is intermediate between quantum discord and quantum steering. Furthermore, we give experimental recipes for preparing quantum states with desired types of quantum correlations.
引用
收藏
页码：2441 / 2453
页数：13
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