Physics – Quantum Physics
Scientific paper
2010-06-27
Phys. Rev. A 83, 020303(R) (2011)
Physics
Quantum Physics
4 pages, 2 figures. v2: minor improvements. v3: negative sign corrected
Scientific paper
10.1103/PhysRevA.83.020303
We present a broad class of states which are diagonal in the basis of N-qubit GHZ states such that non-positivity under the partial transpose operation is necessary and sufficient for the presence of entanglement. This class includes many naturally arising instances such as dephased or depolarised GHZ states. Furthermore, our proof directly leads to an entanglement witness which saturates this bound. The witness is applied to thermal GHZ states to prove that the entanglement can be extremely robust to system imperfections.
No associations
LandOfFree
Optimal Detection of Entanglement in GHZ States does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Optimal Detection of Entanglement in GHZ States, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimal Detection of Entanglement in GHZ States will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-630408