bipartite quantum systems
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Author(s):  
Miao Xu ◽  
Wei-feng Zhou ◽  
Feng Chen ◽  
Lizhen Jiang ◽  
Xiao-yu Chen

Abstract A quantum entangled state is easily disturbed by noise and degenerates into a separable state. Comparing to the entanglement of bipartite quantum systems, less progresses have been made for the entanglement of multipartite quantum systems. For tripartite separability of a four-qubit system, we propose two entanglement witnesses, each of which corresponds to a necessary condition of tripartite separability. For the four-qubit GHZ state mixed with a W state and white noise, it is proved that the necessary conditions of tripartite separability are also sufficient at W state side.


2020 ◽  
Vol 10 (3) ◽  
pp. 792 ◽  
Author(s):  
Bar Y. Peled ◽  
Amit Te’eni ◽  
Danko Georgiev ◽  
Eliahu Cohen ◽  
Avishy Carmi

In this somewhat pedagogical paper we revisit complementarity relations in bipartite quantum systems. Focusing on continuous-variable systems, we examine the influential class of EPR-like states through a generalization to Gaussian states and present some new quantitative relations between entanglement and local interference within symmetric and asymmetric double-double-slit scenarios. This approach is then related to ancilla-based quantum measurements, and weak measurements in particular. Finally, we tie up the notions of distinguishability, predictability, coherence and visibility while drawing some specific connections between them.


2020 ◽  
Vol 101 (1) ◽  
Author(s):  
M. Afsary ◽  
M. Bathaee ◽  
F. Bakhshinezhad ◽  
A. T. Rezakhani ◽  
A. R. Bahrampour

2019 ◽  
Vol 18 (2) ◽  
Author(s):  
D. G. Bussandri ◽  
A. P. Majtey ◽  
P. W. Lamberti ◽  
T. M. Osán

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
Alexander Ramírez Bolaños ◽  
Héctor J. G. Moreno Carrión ◽  
Thomas Gorin

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