Entanglement of 2xK quantum systems

Abstract

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.

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

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• An Introduction to Quantum Entanglement: a Geometric Approach
• Concurrence-based entanglement measure for Werner States
• Concurrence of quasi pure quantum states
• Gate simulation and lower bounds on the simulation time
• Perspectives for a mixed two-qubit system with binomial quantum states
• Concurrence and Entanglement Entropy of Stochastic 1-Qubit Maps
• Witness Operator Provides Better Estimate of the Lower Bound of Concurrence of Bipartite Bound Entangled States in $d_1\otimes d_2$ Dimensional System
• Entanglement criterion for pure $M\otimes N$ bipartite quantum states