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paper

Optimal purification of single qubits

arXiv:quant-ph/9812075 · doi:10.1103/PhysRevLett.82.4344

Abstract

We introduce a new decomposition of the multiqubit states of the form $ρ^{\otimes N}$ and employ it to construct the optimal single qubit purification procedure. The same decomposition allows us to study optimal quantum cloning and state estimation of mixed states.

4 pages, 1 figure