Entanglement purification for arbitrary unknown ionic states via linear optics
Ming Yang, Wei Song, Zhuo‐Liang Cao · Physical Review A · 2005
An entanglement purification scheme for arbitrary unknown (mixed and pure nonmaximally) entangled ionic states is proposed by using linear optical elements. The main advantage of the scheme is that not only two-ion maximally entangled pairs but also four-ion maximally entangled pairs can be extracted from the less entangled pairs. The scheme is within current technology.