Physics – Quantum Physics
Scientific paper
2011-02-24
New Journal of Physics 13, 073016 (2011)
Physics
Quantum Physics
9 figures
Scientific paper
Among various definitions of quantum correlations, quantum discord has attracted considerable attention. To find analytical expression of quantum discord is an intractable task. Exact results are known only for very special states, namely, two-qubit X-shaped states. We present in this paper a geometric viewpoint, from which two-qubit quantum discord can be described clearly. The known results about X state discord are restated in the directly perceivable geometric language. As a consequence, the dynamics of classical correlations and quantum discord for an X state in the presence of decoherence is endowed with geometric interpretation. More importantly, we extend the geometric method to the case of more general states, for which numerical as well as analytica results about quantum discord have not been found yet. Based on the support of numerical computations, some conjectures are proposed to help us establish geometric picture. We find that the geometric picture for these states has intimate relationship with that for X states. Thereby in some cases analytical expressions of classical correlations and quantum discord can be obtained.
Du Jiangfeng
Jiang Fengjian
Shi Mingjun
Sun Chunxiao
No associations
LandOfFree
Geometric picture of quantum discord for two-qubit quantum 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 Geometric picture of quantum discord for two-qubit quantum states, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Geometric picture of quantum discord for two-qubit quantum states will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-86089