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I-concurrence and tangle for isotropic states | | Pranaw Rungta
; Carlton M. Caves
; | | Date: |
1 Aug 2002 | | Subject: | quant-ph | | Abstract: | We discuss properties of entanglement measures called I-concurrence and tangle. For a bipartite pure state, I-concurrence and tangle are simply related to the purity of the marginal density operators. The I-concurrence (tangle) of a bipartite mixed state is the minimum average I-concurrence (tangle) of ensemble decompositions of pure states of the joint density operator. Terhal and Vollbrecht [Phys. Rev. Lett. 85, 2625 (2000)] have given an explicit formula for the entanglement of formation of isotropic states in arbitrary dimensions. We use their formalism to derive comparable expressions for the I-concurrence and tangle of isotropic states. | | Source: | arXiv, quant-ph/0208002 | | Services: | Forum | Review | PDF | Favorites | |
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