Physics – Quantum Physics
Scientific paper
2011-07-27
Phys. Rev. A 84, 052112 (2011)
Physics
Quantum Physics
8 pages, 5 figures
Scientific paper
We present observable lower and upper bounds for the entanglement of formation (EOF) and quantum discord (QD), which facilitates estimates of EOF and QD for arbitrary experimental unknown states in finite-dimensional bipartite systems. These bounds can be easily obtained by a few experimental measurements on a twofold copy $\varrho\otimes\varrho$ of the mixed states. Based on our results, we use the experimental measurement data of the real experiment given by Schmid \textit{et al.} [Phys. Rev. Lett. \textbf{101}, 260505 (2008)] to obtain the lower and upper bounds of EOF and QD for the experimental unknown state.
Chen Qing
Oh Chang-Heon
Yu Sixia
Zhang Chengjie
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