Upper Bound on Singlet Fraction of Two Qubit Mixed Entangled States
arXiv:1403.6929 · doi:10.1007/s11128-016-1295-y
Abstract
We demonstrate the possibility of achieving the maximum possible singlet fraction using a entangled mixed two-qubit state as a resource. For this, we establish a tight upper bound on singlet fraction and show that the maximal singlet fraction obtained in \cite{Verstraete} does not attain the obtained upper bound on the singlet fraction. Interestingly, we found that the required upper bound can in fact be achieved using local filtering operations.
4 pages, 1 figure