Estimating Concurrence via Entanglement Witnesses
Jacek Jurkowski, Dariusz Chruscinski
TL;DR
This paper demonstrates that entanglement witnesses can be used to estimate the concurrence of bipartite entangled states, providing a new method that is compared with existing estimation techniques.
Contribution
It introduces a novel approach linking entanglement witnesses directly to concurrence estimation, enhancing the toolkit for quantifying entanglement.
Findings
Entanglement witnesses can estimate concurrence of bipartite states.
Comparison shows this method aligns with trace norm and realignment estimations.
Illustrations include well-known entanglement witnesses.
Abstract
We show that each entanglement witness detecting 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.
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