Optimal two-qubit gates in recurrence protocols of entanglement purification
arxiv(2022)
摘要
We propose and investigate a method to optimize recurrence entanglement
purification protocols. The approach is based on a numerical search in the
whole set of SU(4) matrices with the aid of a quasi-Newton algorithm. Our
method evaluates average concurrences where the probabilistic occurrence of
mixed entangled states is also taken into account. We show for certain families
of states that optimal protocols are not necessarily achieved by bilaterally
applied controlled-NOT gates. As we discover several optimal solutions, the
proposed method offers some flexibility in experimental implementations of
entanglement purification protocols and interesting perspectives in quantum
information processing.
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