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Pramana

, 91:45 | Cite as

Detecting identical entanglement pure states for two qubits

  • Wei Deng
  • Yong Deng
Article

Abstract

Entanglement is one of the most surprising features of composite quantum systems. Yet, challenges remain in our understanding and quantification of the entanglement. There is no unique degree of entanglement from various measures, as presented by numerous studies on quantifying entanglement. As indicated in this paper, any degree of entanglement for two qubits resulting from a particular measure can be detected in excess of one corresponding pure state. Evidently, those identical entanglement pure states can be counted as a quantitative condition to be satisfied by other proper measures. The most popular measures of pure states for two qubits are based on the same structure, as indicated in this paper. Then, the algorithm to detect the identical entanglement pure states for two qubits is proposed based on randomness distillation. Eventually, two sets of identical entanglement states are listed for two qubits.

Keywords

Identical entanglement detection randomness distillation. 

PACS Nos

03.65.Ud 05.70.–a 02.50.–r 

Notes

Acknowledgements

The authors greatly appreciate the reviewers’ suggestions and the editor’s encouragement. The work was partially supported by the National Natural Science Foundation of China (Grant Nos 61573290 and 61503237).

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.School of Computer and Information ScienceSouthwest UniversityChongqing People’s Republic of China

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