Separability of a family of one-parameter W and Greenberger-Horne-Zeilinger multiqubit states using the Abe-Rajagopal q-conditional-entropy approach

R. Prabhu, A. R. Usha Devi, and G. Padmanabha
Phys. Rev. A 76, 042337 – Published 31 October 2007

Abstract

We employ conditional Tsallis q entropies to study the separability of symmetric one parameter W and GHZ multiqubit mixed states. The strongest limitation on separability is realized in the limit q, and is found to be much superior to the condition obtained using the von Neumann conditional entropy (q=1 case). Except for the example of two qubit and three qubit symmetric states of GHZ family, the q-conditional entropy method leads to sufficient—but not necessary—conditions on separability.

  • Figure
  • Figure
  • Figure
  • Received 22 June 2007

DOI:https://doi.org/10.1103/PhysRevA.76.042337

©2007 American Physical Society

Authors & Affiliations

R. Prabhu1, A. R. Usha Devi2,3,*, and G. Padmanabha2

  • 1Department of Physics, Kuvempu University, Shankaraghatta, Shimoga-577 451, India
  • 2Department of Physics, Bangalore University, Bangalore-560 056, India
  • 3Inspire Institute Inc., McLean, Virginia 22101, USA

  • *arutth@rediffmail.com

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 76, Iss. 4 — October 2007

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review A

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×