The negativity of Wigner function as a measure of quantum correlations

详细信息    查看全文

• 作者：F. Siyouri ; M. El Baz ; Y. Hassouni
• 关键词：Quantum discord ; Entanglement ; Coherent states ; Werner states ; Wigner function ; Non ; classicality
• 刊名：Quantum Information Processing
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：15
• 期：10
• 页码：4237-4252
• 全文大小：1,438 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Mathematics
  Engineering, general
  Computer Science, general
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-1332
• 卷排序：15

文摘

In this paper, we study comparatively the behaviors of Wigner function and quantum correlations for two quasi-Werner states formed with two general bipartite superposed coherent states. We show that the Wigner function can be used to detect and quantify the quantum correlations. However, we show that it is in fact not sensitive to all kinds of quantum correlations but only to entanglement. Then, we analyze the measure of non-classicality of quantum states based on the volume occupied by the negative part of the Wigner function.