任意维数两体量子态的Tangle

Tangle of Arbitrary Dimensional Bipartite Quantum States

利用任意维数两体量子态密度矩阵的concurrence判据、著名的Peres-Horodecki判据及重排判据之间的重要联系,来获得纠缠量tangle(即I-concurrence)的两个解析下界.

We derive two analytical lower bounds for one of entanglement measures called tangle （squared I-concurrence） of a bipartite quantum state in arbitrary dimension by two different ways. They are achieved by an important connection among the concurrence, the well-known Peres-Horodecki, and realignment criteria. At last we give a comparison and find their internal relation of this two bounds.