Physics – Quantum Physics
Scientific paper
2010-12-14
Physics
Quantum Physics
To appear in IJQI
Scientific paper
In the last few years one realized that if the state of a bipartite system can be written as $\sum_{i,j}p_{ij}|a_{i}>< a_{i}|\otimes |b_{j}> < b_{j}|$, where $\{|a_{i}> \}$ and $\{|b_{j}> \}$ form orthonormal basis for the subsystems and $\{p_{ij}\}$ is a probability distribution, then it possesses at most classical correlations. In this article we introduce a nonlinear witness providing a sufficient condition for classicality of correlations (absence of quantum discord) in a broad class of two-qubit systems. Such witness turns out to be necessary and sufficient condition in the case of Bell-diagonal states. We show that the witness introduced here can be readily experimentally implemented in nuclear magnetic resonance setups.
Maziero Jonas
Serra Roberto M.
No associations
LandOfFree
Classicality witness for two-qubit 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 Classicality witness for two-qubit states, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Classicality witness for two-qubit states will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-180046