Estimating concurrence via entanglement witnesses
Jacek Jurkowski, Dariusz Chruściński · Physical Review A · 2010
We show that each entanglement witness detecting a given bipartite entangled state provides an estimation of its concurrence. We illustrate our result with several well-known examples of entanglement witnesses and compare the corresponding estimation of concurrence with other estimations provided by the trace norm of partial transposition and realignment.