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Maximally entangled mixed states for two qubits

Munro, William J.; Nemoto, Kae; James, Daniel F. V.; Vedral, Vlatko


Keyword(s): quantum information; coherent pulses; quantum gate

Abstract: The recent developments in quantum information have lead to a renewed interest in multi particle quantum mechanics. A two-qubit system displays many of the paradoxical features of quantum mechanics such as superposition and entanglement. Such states can be partially characterized by their degree of impurity and degree of entanglement. We specifically examine the class of states that have the maximum amount of entanglement (EOF) for a given degree of impurity. We show how these states are more entangled than the Werner like state for a given degree of mixture for several measures of entanglement. Notes: Kae Nemoto, School of Informatics, Dean Street, University of Wales, Bangor, LL57 1UT, UK Daniel F.V. James, Theory Division, T-4, Los Alamos National Laboratory, Los Alamos, New Mexico, USA Vlatko Vedral, Optics Section, Blackett Laboratory, Imperial College, London, SW7 2BW, UK

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