Optimal copying of entangled two-qubit states

J. Novotný, G. Alber, and I. Jex
Phys. Rev. A 71, 042332 – Published 21 April 2005

Abstract

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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  • Received 23 October 2004

DOI:https://doi.org/10.1103/PhysRevA.71.042332

©2005 American Physical Society

Authors & Affiliations

J. Novotný1, G. Alber2, and I. Jex1

  • 1Department of Physics, FJFI ČVUT, Břehová 7, 115 19 Praha 1-Staré Město, Czech Republic
  • 2Institut für Angewandte Physik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany

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Issue

Vol. 71, Iss. 4 — April 2005

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