Physics – Quantum Physics
Scientific paper
2012-02-13
Physics
Quantum Physics
7 pages, 5 figs
Scientific paper
In the two-qubit system under the local depolarizing channels, the most robust and the most fragile states for a given concurrence or negativity are derived. For the one-sided channel, with the aid of the evolution equation for entanglement given by Konrad \emph{et al.} [Nat. Phys. 4, 99 (2008)], the pure states are proved to be the most robust. Based on a generalization of the evolution equation, we classify the ansatz states in our investigation by the amount of robustness, and consequently derive the most fragile states. For the two-sided channel, the pure states are proved to be the most robust for a fixed concurrence, but is the most fragile with a given negativity when the channel is uniform. Under the uniform channel, for a given negativity, the most robust states are the ones with the maximal concurrence, which are also the most fragile states when the concurrence is given in the region of $[1/2,1]$. When the entanglement approaches zero, the most fragile states for a given negativity become the pure states, but the ones for concurrence turn into a mixture of two separable pure states.
Jiang Yue
Liang Mai-Lin
Pang Chao-Qian
Zhang Fu-Lin
No associations
LandOfFree
Most robust and fragile two-qubit entangled states under depolarizing channels 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 Most robust and fragile two-qubit entangled states under depolarizing channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Most robust and fragile two-qubit entangled states under depolarizing channels will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-684113