Phys. Rev. Lett. 78, 5022–5025 (1997)Entanglement of a Pair of Quantum BitsReceived 3 March 1997; published in the issue dated 30 June 1997 The “entanglement of formation” of a mixed state ρ of a bipartite quantum system can be defined as the minimum number of singlets needed to create an ensemble of pure states that represents ρ. We find an exact formula for the entanglement of formation for all mixed states of two qubits having no more than two nonzero eigenvalues, and we report evidence suggesting that the formula is valid for all states of this system. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.5022
DOI:
10.1103/PhysRevLett.78.5022
PACS:
89.70.+c, 03.65.Bz
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