Entanglement of Formation of an Arbitrary State of Two Qubits

Abstract

The entanglement of a pure state of a pair of quantum systems is defined as the entropy of either member of the pair. The entanglement of formation of a mixed state ρ is defined as the minimum average entanglement of a set of pure states constituting a decomposition of ρ. An earlier paper [Phys. Rev. Lett. 78, 5022 (1997)] conjectured an explicit formula… (More)

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