Quantum Information Processing

, Volume 14, Issue 1, pp 287–301 | Cite as

Entanglement witnesses generated by positive maps

  • Wei Yang


Entanglement witnesses are non-positive Hermitian operators which can detect whether a quantum state is entangled. Positive maps based on one and two given quantum states are constructed, and entanglement witnesses are generated by composing the positive maps with affine maps. An entanglement witness example is given at the end.


Quantum states Entanglement witnesses Positive maps Affine maps 



The author would like to thank the editor and the reviewers for their constructive comments and suggestions to improve the quality of the paper. This work was funded by project 13XKJC01 from Leading Academic Discipline Project of Shanghai Dianji University and the funding scheme for training young teachers in colleges and universities in Shanghai (ZZSDJ14023).


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Mathematics and PhysicsShanghai Dianji UniversityShanghaiPeople’s Republic of China

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