Phys. Rev. A 62, 062315 (2000) [5 pages]Optimal local preparation of an arbitrary mixed state of two qubits: Closed expression for the single-copy caseReceived 1 March 2000; published 14 November 2000 We consider the problem of preparing a single copy of an arbitrary two-qubit mixed state ρ, starting from an entangled pure state ψ and using only local operations assisted with classical communication. We present an analytical expression for the minimal amount of pure-state entanglement required, and describe the corresponding local strategy. We also examine optimal probabilistic generalizations of the previous process. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.062315
DOI:
10.1103/PhysRevA.62.062315
PACS:
03.67.-a
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