Optimal copying of entangled two-qubit states

Details Optimal copying of entangled two-qubit states Optimal copying of entangled two-qubit states

2004-11-15

arxiv.org/abs/quant-ph/0411105v1

Physics

Quantum Physics

13 pages, 7 figures

Scientific paper

10.1103/PhysRevA.71.042332

We investigate the problem of copying pure two-qubit states of a given degree of entanglement in an optimal way. Completely positive covariant quantum operations are constructed which maximize the fidelity of the output states with respect to two separable copies. These optimal copying processes hint at the intricate relationship between fundamental laws of quantum theory and entanglement.

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