Cloning the entanglement of a pair of quantum bits

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.

4 pages Revtex, 2 encapsulated Postscript figures, one added author

References in corpus (1)

• Cloning a real d-dimensional quantum state on the edge of the no-signaling condition

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