Cloning the entanglement of a pair of quantum bits
Quantum Physics
2009-11-10 v2
Abstract
It is shown that any quantum operation that perfectly clones the entanglement of all maximally-entangled qubit pairs cannot preserve separability. This ``entanglement no-cloning'' principle naturally suggests that some approximate cloning of entanglement is nevertheless allowed by quantum mechanics. We investigate a separability-preserving optimal cloning machine that duplicates all maximally-entangled states of two qubits, resulting in 0.285 bits of entanglement per clone, while a local cloning machine only yields 0.060 bits of entanglement per clone.
Keywords
Cite
@article{arxiv.quant-ph/0302173,
title = {Cloning the entanglement of a pair of quantum bits},
author = {Louis-Philippe Lamoureux and Patrick Navez and Jaromir Fiurasek and Nicolas J. Cerf},
journal= {arXiv preprint arXiv:quant-ph/0302173},
year = {2009}
}
Comments
4 pages Revtex, 2 encapsulated Postscript figures, one added author