Entanglement of 2xK quantum systems

Details Entanglement of 2xK quantum systems Entanglement of 2xK quantum systems

2003-02-19

arxiv.org/abs/quant-ph/0302144v1

Europhys. Lett. 62, 168 (2003)

Physics

Quantum Physics

7 pages, 1 figure, to be published in Europhysics Letter

Scientific paper

10.1209/epl/i2003-00342-y

We derive an analytical expression for the lower bound of the concurrence of mixed quantum states of composite 2xK systems. In contrast to other, implicitly defined entanglement measures, the numerical evaluation of our bound is straightforward. We explicitly evaluate its tightness for general mixed states of 2x3 systems, and identify a large class of states where our expression gives the exact value of the concurrence.

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