Einstein-Podolsky-Rosen steering in critical systems

被引:5
作者
Cheng, W. W. [1 ,2 ]
Wang, K. [1 ]
Wang, W. F. [1 ]
Guo, Y. J. [3 ]
机构
[1] Nanjing Univ Posts & Telecommun, Inst Signal Proc & Transmiss, Nanjing 210003, Jiangsu, Peoples R China
[2] Univ Turku, Turku Ctr Quantum Phys, Dept Phys & Astron, FI-20014 Turun, Finland
[3] Jiangsu Second Normal Univ, Sch Phys & Elect Engn, Nanjing 210013, Jiangsu, Peoples R China
关键词
Einstein-Podolsky-Rosen steering; quantum phase transitions; quantum nonlocality; ENTANGLEMENT;
D O I
10.1088/1361-6455/ab0238
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We explore Einstein-Podolsky-Rosen steering, measured by steering robustness, in the ground states of several typical models that exhibit a quantum phase transition. For the anisotropic XY model, steering robustness approaches zero around the critical point and vanishes in the ferromagnetic phase despite the fact that there exist other quantum nonlocalities, e.g. quantum entanglement. For the Heisenberg XXZ model, steering robustness exhibits some similar behavior as entanglement around the infinite-order quantum phase transition point Delta = 1, e.g. reaching its maximum. As a further example, we also consider steering robustness in the Lipkin-Meshkov-Glick collective spin model. It is then shown that steering robustness disappears at the transition point and remains at zero in the fully polarized symmetric phase, just like the behavior of entanglement and Bell nonlocality.
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页数:8
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