Maximally entangled mixed states of two qubits

Preprint
Publisher Website
Google Scholar
  • 28 November 2000
Abstract
We consider mixed states of two qubits and show under which global unitary operations their entanglement is maximized. This leads to a class of states that is a generalization of the Bell states. Two measures of entanglement are considered: entanglement of formation and negativity. Surprisingly all states that maximize one measure also maximize the other. We will give a complete characterization of these generalized Bell states and prove that these states for fixed eigenvalues are all equivalent under local unitary transformations. We will furthermore characterize all nearly entangled states closest to the maximally mixed state.

This publication has 0 references indexed in Scilit: