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Local Cloning of Entangled Qubits

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arxiv 0706.2459 v2 pith:JN632ZQK submitted 2007-06-17 quant-ph

Local Cloning of Entangled Qubits

classification quant-ph
keywords qubitsentangledamountcloningebitlocalnecessarystates
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss the exact cloning of orthogonal but entangled qubits under local operations and classical communication. The amount of entanglement necessary in blank copy is obtained for various cases. Surprisingly this amount is more than 1 ebit for certain set of two nonmaximal but equally entangled states of two qubits system. To clone any three two qubits Bell states at least log2 3 ebit is necessary.

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