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Maximising the Entanglement of Two Mixed Qubits

Munro, W.J.; James, D.F.V.; White, A.G.; Kwiat, P.G.

HPL-2001-65

Keyword(s): maximally entangled mixed states; entanglement characterisation

Abstract: Two-qubit states occupy a large and relatively unexplored Hilbert space. Such states can be succinctly characterized by their degree of entanglement and purity. In this letter we investigate entangled mixed states and present a class of states that have the maximum amount of entanglement for a given linear entropy. Notes: D.F.V. James, Theory Division, T-4, Los Alamos National Laboratory, Los Alamos, New Mexico, USA. A.G. White, Special Research Centre for Quantum Computer Technology, University of Queensland, Brisbane, Australia. P.G. Kwiat, Department of Physics, University of Illinois, Urbana- Champaign, Illinois, USA.

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