›› 2014, Vol. 23 ›› Issue (9): 90306-090306.doi: 10.1088/1674-1056/23/9/090306

• GENERAL • 上一篇    下一篇

Comments on “Distillability sudden death in qutrit–qutrit systems under thermal reservoirs”

Mazhar Ali   

  1. Department of Electrical Engineering, COMSATS Institute of Information Technology, 22060 Abbottabad, Pakistan
  • 收稿日期:2013-12-29 修回日期:2014-02-17 出版日期:2014-09-15 发布日期:2014-09-15

Comments on “Distillability sudden death in qutrit–qutrit systems under thermal reservoirs”

Mazhar Ali   

  1. Department of Electrical Engineering, COMSATS Institute of Information Technology, 22060 Abbottabad, Pakistan
  • Received:2013-12-29 Revised:2014-02-17 Online:2014-09-15 Published:2014-09-15
  • Contact: Mazhar Ali E-mail:mazharaliawan@yahoo.com

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摘要： In a recent paper (2012 Chin. Phys. B 21 084205), the authors studied the problem of distillability sudden death. We find that their equation of motion is incorrect and consequently the rest of the paper is wrong. Even apart from starting with a wrong equation of motion, their description of the phenomenon of distillability sudden death is totally misleading and needs to be rectified. To this aim, we show that certain initially prepared free-entangled states become bound-entangled in a finite time under thermal reservoirs. Moreover, in contrast with zero-temperature reservoirs, simple local unitary transformations cannot completely avoid distillability sudden death.

关键词: distillability, thermal reservoirs, bound entanglement

Abstract: In a recent paper (2012 Chin. Phys. B 21 084205), the authors studied the problem of distillability sudden death. We find that their equation of motion is incorrect and consequently the rest of the paper is wrong. Even apart from starting with a wrong equation of motion, their description of the phenomenon of distillability sudden death is totally misleading and needs to be rectified. To this aim, we show that certain initially prepared free-entangled states become bound-entangled in a finite time under thermal reservoirs. Moreover, in contrast with zero-temperature reservoirs, simple local unitary transformations cannot completely avoid distillability sudden death.

Key words: distillability, thermal reservoirs, bound entanglement

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 03.65.Ud (Entanglement and quantum nonlocality)