Matching relations for optimal entanglement concentration and purification.

Abstract:

:The bilateral controlled NOT (CNOT) operation plays a key role in standard entanglement purification process, but the CNOT operation may not be the optimal joint operation in the sense that the output entanglement is maximized. In this paper, the CNOT operations in both the Schmidt-projection based entanglement concentration and the entanglement purification schemes are replaced with a general joint unitary operation, and the optimal matching relations between the entangling power of the joint unitary operation and the non-maximal entangled channel are found for optimizing the entanglement in- crement or the output entanglement. The result is somewhat counter-intuitive for entanglement concentration. The output entanglement is maximized when the entangling power of the joint unitary operation and the quantum channel satisfy certain relation. There exist a variety of joint operations with non-maximal entangling power that can induce a maximal output entanglement, which will greatly broaden the set of the potential joint operations in entanglement concentration. In addition, the entanglement increment in purification process is maximized only by the joint unitary operations (including CNOT) with maximal entangling power.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kong FZ,Xia HZ,Yang M,Yang Q,Cao ZL

doi

10.1038/srep25958

subject

Has Abstract

pub_date

2016-05-18 00:00:00

pages

25958

issn

2045-2322

pii

srep25958

journal_volume

6

pub_type

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