Cloning the entanglement of a pair of quantum bits

Details Cloning the entanglement of a pair of quantum bits Cloning the entanglement of a pair of quantum bits

2003-02-22

arxiv.org/abs/quant-ph/0302173v2

Phys. Rev. A 69, 040301 (2004).

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevA.69.040301

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.

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